[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,18
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,27+5=32
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,32
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,54+1=55
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,55
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,9×3=27
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,9×3=？
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,9×6=54
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,上边还有进位3
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,再加3得66
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,另一个6
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,大家还记得住吧
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,希望大家能有所收获
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,得18
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,得63
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,得63以后
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,得66258
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,换一个颜色
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,没地方再写
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,然后 9×6
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,然后9×7
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,直接写在这就行了
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,这写6
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,那么7362×9
Dialogue: 0,0:00:00.53,0:00:01.67,Default,,0000,0000,0000,,如果之前的练习你都做了
Dialogue: 0,0:00:01.67,0:00:04.73,Default,,0000,0000,0000,,并且已经记住了乘法表
Dialogue: 0,0:00:04.73,0:00:08.78,Default,,0000,0000,0000,,那么你应该有这种感觉
Dialogue: 0,0:00:08.78,0:00:11.06,Default,,0000,0000,0000,,可能自己已经可以解决任何乘法问题了！
Dialogue: 0,0:00:11.06,0:00:12.70,Default,,0000,0000,0000,,你只需要记住--
Dialogue: 0,0:00:12.70,0:00:14.34,Default,,0000,0000,0000,,怎么说呢--
Dialogue: 0,0:00:14.35,0:00:15.84,Default,,0000,0000,0000,,记住运算的一般步骤就可以了
Dialogue: 0,0:00:15.84,0:00:17.76,Default,,0000,0000,0000,,但是我不是要教大家做题步骤
Dialogue: 0,0:00:17.76,0:00:20.28,Default,,0000,0000,0000,,而是这种运算的本质和原理
Dialogue: 0,0:00:20.28,0:00:23.42,Default,,0000,0000,0000,,先来做一些
Dialogue: 0,0:00:23.42,0:00:30.12,Default,,0000,0000,0000,,你可能觉得自己不会的题目吧
Dialogue: 0,0:00:30.12,0:00:31.86,Default,,0000,0000,0000,,16×9
Dialogue: 0,0:00:31.86,0:00:32.86,Default,,0000,0000,0000,,16乘以9
Dialogue: 0,0:00:32.86,0:00:36.00,Default,,0000,0000,0000,,你可以会说
Dialogue: 0,0:00:36.00,0:00:38.79,Default,,0000,0000,0000,,老师 我没有记住16的乘法表
Dialogue: 0,0:00:38.79,0:00:41.21,Default,,0000,0000,0000,,不可能会做这个题
Dialogue: 0,0:00:41.21,0:00:43.29,Default,,0000,0000,0000,,但是我要告诉你的是
Dialogue: 0,0:00:43.29,0:00:45.26,Default,,0000,0000,0000,,你一定会做！
Dialogue: 0,0:00:45.26,0:00:46.53,Default,,0000,0000,0000,,因为我们可以把这个问题分解成
Dialogue: 0,0:00:46.53,0:00:49.71,Default,,0000,0000,0000,,你会做的题目
Dialogue: 0,0:00:49.71,0:00:52.24,Default,,0000,0000,0000,,到底怎么做呢？
Dialogue: 0,0:00:52.25,0:00:54.82,Default,,0000,0000,0000,,首先是9乘以这个数的个位
Dialogue: 0,0:00:54.82,0:00:56.76,Default,,0000,0000,0000,,9×6
Dialogue: 0,0:00:56.77,0:01:01.09,Default,,0000,0000,0000,,这个大家肯定都会的
Dialogue: 0,0:01:01.10,0:01:03.38,Default,,0000,0000,0000,,我写在这边
Dialogue: 0,0:01:03.38,0:01:05.86,Default,,0000,0000,0000,,9×6=54
Dialogue: 0,0:01:05.86,0:01:08.98,Default,,0000,0000,0000,,知道乘法表就可以得出来
Dialogue: 0,0:01:08.98,0:01:11.94,Default,,0000,0000,0000,,那么要写下54来
Dialogue: 0,0:01:11.94,0:01:13.71,Default,,0000,0000,0000,,但是只能把4写在个位这里
Dialogue: 0,0:01:13.71,0:01:17.00,Default,,0000,0000,0000,,5是进位
Dialogue: 0,0:01:17.00,0:01:19.76,Default,,0000,0000,0000,,这就是运算的步骤
Dialogue: 0,0:01:19.76,0:01:21.11,Default,,0000,0000,0000,,在做加法时
Dialogue: 0,0:01:21.13,0:01:24.11,Default,,0000,0000,0000,,如果产生了大于9的数
Dialogue: 0,0:01:24.11,0:01:28.43,Default,,0000,0000,0000,,就要进位
Dialogue: 0,0:01:28.43,0:01:29.33,Default,,0000,0000,0000,,这种运算就是进位 没什么别的描述方法了
Dialogue: 0,0:01:29.33,0:01:31.16,Default,,0000,0000,0000,,然后9×1
Dialogue: 0,0:01:31.16,0:01:33.49,Default,,0000,0000,0000,,9乘以1
Dialogue: 0,0:01:33.50,0:01:35.65,Default,,0000,0000,0000,,这个很简单
Dialogue: 0,0:01:35.65,0:01:38.67,Default,,0000,0000,0000,,9×1=9
Dialogue: 0,0:01:38.68,0:01:40.74,Default,,0000,0000,0000,,任何数乘以1都等于本身
Dialogue: 0,0:01:40.75,0:01:45.14,Default,,0000,0000,0000,,但是上边还有个进位5
Dialogue: 0,0:01:45.14,0:01:47.10,Default,,0000,0000,0000,,9×1=9
Dialogue: 0,0:01:47.10,0:01:50.16,Default,,0000,0000,0000,,还要再加上5
Dialogue: 0,0:01:50.16,0:01:55.64,Default,,0000,0000,0000,,所以再加5
Dialogue: 0,0:01:55.64,0:01:57.70,Default,,0000,0000,0000,,得到什么呢？
Dialogue: 0,0:01:57.70,0:01:59.69,Default,,0000,0000,0000,,9×1+5
Dialogue: 0,0:01:59.69,0:02:00.59,Default,,0000,0000,0000,,得14
Dialogue: 0,0:02:00.59,0:02:04.18,Default,,0000,0000,0000,,我写在这里
Dialogue: 0,0:02:04.18,0:02:06.53,Default,,0000,0000,0000,,14
Dialogue: 0,0:02:06.53,0:02:08.44,Default,,0000,0000,0000,,这样就得出结果了
Dialogue: 0,0:02:08.44,0:02:12.26,Default,,0000,0000,0000,,16×9=144
Dialogue: 0,0:02:12.26,0:02:14.66,Default,,0000,0000,0000,,如果你一直记到12的乘法表的话
Dialogue: 0,0:02:14.66,0:02:17.50,Default,,0000,0000,0000,,应该要注意到144=12×12
Dialogue: 0,0:02:17.50,0:02:19.22,Default,,0000,0000,0000,,不过只知道9×6和9×1
Dialogue: 0,0:02:19.22,0:02:20.54,Default,,0000,0000,0000,,也可以解出这个难题
Dialogue: 0,0:02:20.55,0:02:22.16,Default,,0000,0000,0000,,现在你可能说 老师
Dialogue: 0,0:02:22.16,0:02:25.15,Default,,0000,0000,0000,,这不过是你耍的一个小把戏
Dialogue: 0,0:02:25.15,0:02:27.92,Default,,0000,0000,0000,,这怎么可能呢？是为什么？
Dialogue: 0,0:02:27.93,0:02:32.87,Default,,0000,0000,0000,,大家应该经常这么问
Dialogue: 0,0:02:32.87,0:02:34.98,Default,,0000,0000,0000,,不要只是被动的接受我说的话
Dialogue: 0,0:02:34.99,0:02:36.93,Default,,0000,0000,0000,,不要死记公式方法
Dialogue: 0,0:02:36.93,0:02:37.86,Default,,0000,0000,0000,,生搬硬套
Dialogue: 0,0:02:37.86,0:02:40.76,Default,,0000,0000,0000,,那么 我换个写法给大家解释一下
Dialogue: 0,0:02:40.77,0:02:44.19,Default,,0000,0000,0000,,可以把16改成10--
Dialogue: 0,0:02:44.19,0:02:46.96,Default,,0000,0000,0000,,在这里写吧
Dialogue: 0,0:02:46.96,0:02:50.83,Default,,0000,0000,0000,,16=10+6
Dialogue: 0,0:02:50.84,0:02:52.81,Default,,0000,0000,0000,,把16拆开了
Dialogue: 0,0:02:52.81,0:02:56.49,Default,,0000,0000,0000,,当然9也可以拆
Dialogue: 0,0:02:56.50,0:02:59.58,Default,,0000,0000,0000,,不过只是一位数 可以留着
Dialogue: 0,0:02:59.59,0:03:00.99,Default,,0000,0000,0000,,就像这样
Dialogue: 0,0:03:00.99,0:03:02.88,Default,,0000,0000,0000,,下面来看看这个问题究竟怎么回事
Dialogue: 0,0:03:02.88,0:03:04.39,Default,,0000,0000,0000,,在这写一个乘法号
Dialogue: 0,0:03:04.40,0:03:06.05,Default,,0000,0000,0000,,首先要用9乘以6
Dialogue: 0,0:03:06.06,0:03:08.31,Default,,0000,0000,0000,,你可能要问
Dialogue: 0,0:03:08.31,0:03:10.71,Default,,0000,0000,0000,,老师你为什么要这么分16呢？
Dialogue: 0,0:03:10.71,0:03:11.84,Default,,0000,0000,0000,,其实我是把16的个位和
Dialogue: 0,0:03:11.84,0:03:15.40,Default,,0000,0000,0000,,十位拆开
Dialogue: 0,0:03:15.40,0:03:16.53,Default,,0000,0000,0000,,这个从右数的第二列
Dialogue: 0,0:03:16.53,0:03:21.74,Default,,0000,0000,0000,,这可不是个1 而是10
Dialogue: 0,0:03:21.75,0:03:25.06,Default,,0000,0000,0000,,16左边的1是10 所以拆成10+6
Dialogue: 0,0:03:25.06,0:03:27.27,Default,,0000,0000,0000,,这就是这么拆的原因
Dialogue: 0,0:03:27.28,0:03:29.34,Default,,0000,0000,0000,,好 现在来运算
Dialogue: 0,0:03:29.34,0:03:30.58,Default,,0000,0000,0000,,跟刚刚的方法一样
Dialogue: 0,0:03:30.59,0:03:32.85,Default,,0000,0000,0000,,9×6--
Dialogue: 0,0:03:32.85,0:03:35.41,Default,,0000,0000,0000,,写下来
Dialogue: 0,0:03:35.41,0:03:36.77,Default,,0000,0000,0000,,9×6=54
Dialogue: 0,0:03:36.77,0:03:39.54,Default,,0000,0000,0000,,但是这里不写54
Dialogue: 0,0:03:39.54,0:03:40.68,Default,,0000,0000,0000,,而是拆成50+4
Dialogue: 0,0:03:40.68,0:03:42.17,Default,,0000,0000,0000,,9×6=50+4
Dialogue: 0,0:03:42.17,0:03:46.73,Default,,0000,0000,0000,,好了 这一列代表个位
Dialogue: 0,0:03:46.74,0:03:48.33,Default,,0000,0000,0000,,画一条虚线来分隔
Dialogue: 0,0:03:48.34,0:03:50.47,Default,,0000,0000,0000,,这边是个位
Dialogue: 0,0:03:50.47,0:03:52.37,Default,,0000,0000,0000,,只能写一个4
Dialogue: 0,0:03:52.38,0:03:55.85,Default,,0000,0000,0000,,但还要写50
Dialogue: 0,0:03:55.85,0:03:57.83,Default,,0000,0000,0000,,要找个地方写50
Dialogue: 0,0:03:57.84,0:03:59.83,Default,,0000,0000,0000,,惯例是--
Dialogue: 0,0:03:59.83,0:04:01.71,Default,,0000,0000,0000,,至少我学的是这样--
Dialogue: 0,0:04:01.71,0:04:03.48,Default,,0000,0000,0000,,把50写在这上边
Dialogue: 0,0:04:03.48,0:04:06.62,Default,,0000,0000,0000,,当然也可以写在下面
Dialogue: 0,0:04:06.62,0:04:09.95,Default,,0000,0000,0000,,只要记得
Dialogue: 0,0:04:09.95,0:04:14.85,Default,,0000,0000,0000,,运算时得到十位有个50就行
Dialogue: 0,0:04:14.85,0:04:16.28,Default,,0000,0000,0000,,可以把50写在这
Dialogue: 0,0:04:16.28,0:04:18.86,Default,,0000,0000,0000,,跟第一个题做的一样
Dialogue: 0,0:04:18.87,0:04:20.43,Default,,0000,0000,0000,,只写一个5
Dialogue: 0,0:04:20.43,0:04:22.83,Default,,0000,0000,0000,,刚刚就是只写了一个5
Dialogue: 0,0:04:22.83,0:04:25.04,Default,,0000,0000,0000,,因为这个5是在十位的
Dialogue: 0,0:04:25.04,0:04:26.86,Default,,0000,0000,0000,,实际上代表的是50
Dialogue: 0,0:04:26.87,0:04:28.71,Default,,0000,0000,0000,,十位的1就是10
Dialogue: 0,0:04:28.71,0:04:33.85,Default,,0000,0000,0000,,不过现在我要写50
Dialogue: 0,0:04:33.85,0:04:35.85,Default,,0000,0000,0000,,这样大家看的比较清楚 就代表50 或者10
Dialogue: 0,0:04:35.85,0:04:39.01,Default,,0000,0000,0000,,然后 9×10=？
Dialogue: 0,0:04:39.01,0:04:40.54,Default,,0000,0000,0000,,9×10
Dialogue: 0,0:04:40.54,0:04:45.62,Default,,0000,0000,0000,,这个我们也记过的
Dialogue: 0,0:04:45.62,0:04:50.55,Default,,0000,0000,0000,,任何数乘以10就是这个数后边添个0
Dialogue: 0,0:04:50.55,0:04:51.87,Default,,0000,0000,0000,,得90
Dialogue: 0,0:04:51.87,0:04:53.41,Default,,0000,0000,0000,,9×10=90
Dialogue: 0,0:04:53.41,0:04:54.92,Default,,0000,0000,0000,,再加50
Dialogue: 0,0:04:54.92,0:04:57.34,Default,,0000,0000,0000,,90+50
Dialogue: 0,0:04:57.34,0:04:58.88,Default,,0000,0000,0000,,等于多少呢？
Dialogue: 0,0:04:58.88,0:05:00.25,Default,,0000,0000,0000,,是140
Dialogue: 0,0:05:00.25,0:05:02.18,Default,,0000,0000,0000,,9×10=90
Dialogue: 0,0:05:02.19,0:05:06.12,Default,,0000,0000,0000,,90+50=140
Dialogue: 0,0:05:06.12,0:05:07.23,Default,,0000,0000,0000,,为了跟之前写的保持一致
Dialogue: 0,0:05:07.24,0:05:09.02,Default,,0000,0000,0000,,可以把140写成100+40
Dialogue: 0,0:05:09.02,0:05:13.21,Default,,0000,0000,0000,,所以我们要把40放在这里
Dialogue: 0,0:05:13.21,0:05:16.15,Default,,0000,0000,0000,,百位进1
Dialogue: 0,0:05:16.15,0:05:19.44,Default,,0000,0000,0000,,但是100不知道放在哪
Dialogue: 0,0:05:19.45,0:05:22.00,Default,,0000,0000,0000,,可以写在这
Dialogue: 0,0:05:22.00,0:05:24.86,Default,,0000,0000,0000,,可以--
Dialogue: 0,0:05:24.87,0:05:35.16,Default,,0000,0000,0000,,也可以写在这
Dialogue: 0,0:05:35.16,0:05:37.77,Default,,0000,0000,0000,,写在这里
Dialogue: 0,0:05:37.77,0:05:39.26,Default,,0000,0000,0000,,很多地方可以写
Dialogue: 0,0:05:39.26,0:05:40.51,Default,,0000,0000,0000,,这个100
Dialogue: 0,0:05:40.51,0:05:41.80,Default,,0000,0000,0000,,但是最重要的一点不要忘记
Dialogue: 0,0:05:41.80,0:05:42.82,Default,,0000,0000,0000,,这个一百是在百位上
Dialogue: 0,0:05:42.82,0:05:47.13,Default,,0000,0000,0000,,分隔线我刚没画
Dialogue: 0,0:05:47.14,0:05:49.95,Default,,0000,0000,0000,,这样再写一个100
Dialogue: 0,0:05:49.95,0:05:52.84,Default,,0000,0000,0000,,得到是100+40+4
Dialogue: 0,0:05:52.85,0:05:54.82,Default,,0000,0000,0000,,即144
Dialogue: 0,0:05:54.82,0:05:56.00,Default,,0000,0000,0000,,希望大家能听懂
Dialogue: 0,0:05:56.01,0:05:59.56,Default,,0000,0000,0000,,再来多做几个题
Dialogue: 0,0:05:59.56,0:06:02.10,Default,,0000,0000,0000,,多看例题是很重要的
Dialogue: 0,0:06:02.11,0:06:04.18,Default,,0000,0000,0000,,计算55×8
Dialogue: 0,0:06:04.18,0:06:07.17,Default,,0000,0000,0000,,55×8
Dialogue: 0,0:06:07.18,0:06:08.18,Default,,0000,0000,0000,,差不多的例题
Dialogue: 0,0:06:08.18,0:06:11.91,Default,,0000,0000,0000,,要用8开始乘
Dialogue: 0,0:06:11.92,0:06:14.71,Default,,0000,0000,0000,,8×5
Dialogue: 0,0:06:14.71,0:06:18.83,Default,,0000,0000,0000,,我先写下来
Dialogue: 0,0:06:18.83,0:06:27.26,Default,,0000,0000,0000,,8×5=40
Dialogue: 0,0:06:27.27,0:06:28.95,Default,,0000,0000,0000,,把0写在这
Dialogue: 0,0:06:28.95,0:06:31.24,Default,,0000,0000,0000,,进位4
Dialogue: 0,0:06:31.25,0:06:33.05,Default,,0000,0000,0000,,然后又是8×5
Dialogue: 0,0:06:33.05,0:06:36.55,Default,,0000,0000,0000,,还是40
Dialogue: 0,0:06:36.55,0:06:40.47,Default,,0000,0000,0000,,不过再加上进位4 是44
Dialogue: 0,0:06:40.47,0:06:43.59,Default,,0000,0000,0000,,代表的是440
Dialogue: 0,0:06:43.60,0:06:46.54,Default,,0000,0000,0000,,你可以像我上个题一样
Dialogue: 0,0:06:46.55,0:06:49.75,Default,,0000,0000,0000,,把55拆成50+5再分别乘以8
Dialogue: 0,0:06:49.75,0:06:52.04,Default,,0000,0000,0000,,不过做的题多了
Dialogue: 0,0:06:52.04,0:06:53.48,Default,,0000,0000,0000,,应该大家会习惯这么运算的
Dialogue: 0,0:06:53.49,0:06:55.58,Default,,0000,0000,0000,,再做一个--
Dialogue: 0,0:06:55.58,0:06:57.96,Default,,0000,0000,0000,,换个颜色
Dialogue: 0,0:06:57.97,0:07:01.79,Default,,0000,0000,0000,,浅红色
Dialogue: 0,0:07:01.80,0:07:02.56,Default,,0000,0000,0000,,用78乘以--
Dialogue: 0,0:07:02.56,0:07:06.18,Default,,0000,0000,0000,,乘以7
Dialogue: 0,0:07:06.18,0:07:08.19,Default,,0000,0000,0000,,8×7
Dialogue: 0,0:07:08.19,0:07:09.68,Default,,0000,0000,0000,,8×7=56
Dialogue: 0,0:07:09.68,0:07:13.81,Default,,0000,0000,0000,,写下来--这又是一个新题
Dialogue: 0,0:07:13.82,0:07:16.80,Default,,0000,0000,0000,,8×7=56
Dialogue: 0,0:07:16.80,0:07:25.86,Default,,0000,0000,0000,,把6写在下边 进位5写在上边
Dialogue: 0,0:07:25.86,0:07:27.60,Default,,0000,0000,0000,,7×7=49
Dialogue: 0,0:07:27.60,0:07:31.39,Default,,0000,0000,0000,,7乘以7得49
Dialogue: 0,0:07:31.39,0:07:33.07,Default,,0000,0000,0000,,还要加上边的5
Dialogue: 0,0:07:33.08,0:07:35.29,Default,,0000,0000,0000,,再加上5
Dialogue: 0,0:07:35.29,0:07:36.85,Default,,0000,0000,0000,,49+5=？
Dialogue: 0,0:07:36.85,0:07:38.36,Default,,0000,0000,0000,,是54
Dialogue: 0,0:07:38.37,0:07:40.33,Default,,0000,0000,0000,,7×7=49
Dialogue: 0,0:07:40.33,0:07:42.95,Default,,0000,0000,0000,,49+5=54
Dialogue: 0,0:07:42.95,0:07:46.24,Default,,0000,0000,0000,,得546
Dialogue: 0,0:07:46.25,0:07:47.54,Default,,0000,0000,0000,,不久前你可能还觉得
Dialogue: 0,0:07:47.54,0:07:49.12,Default,,0000,0000,0000,,光用1-12的乘法表
Dialogue: 0,0:07:49.12,0:07:50.15,Default,,0000,0000,0000,,肯定求不出78的乘法表
Dialogue: 0,0:07:50.16,0:07:51.94,Default,,0000,0000,0000,,但大家可以看到过程其实非常简单
Dialogue: 0,0:07:51.94,0:07:54.51,Default,,0000,0000,0000,,再多做几个
Dialogue: 0,0:07:54.52,0:07:57.76,Default,,0000,0000,0000,,一直算到不能再算为止
Dialogue: 0,0:07:57.76,0:07:59.14,Default,,0000,0000,0000,,算到精疲力竭为止
Dialogue: 0,0:07:59.14,0:08:04.15,Default,,0000,0000,0000,,89×3
Dialogue: 0,0:08:04.15,0:08:06.69,Default,,0000,0000,0000,,89×3=？
Dialogue: 0,0:08:06.69,0:08:09.18,Default,,0000,0000,0000,,3×9=27
Dialogue: 0,0:08:09.18,0:08:20.37,Default,,0000,0000,0000,,7写在个位
Dialogue: 0,0:08:20.37,0:08:23.18,Default,,0000,0000,0000,,向十位进位2
Dialogue: 0,0:08:23.18,0:08:24.71,Default,,0000,0000,0000,,因为27=20+7
Dialogue: 0,0:08:24.71,0:08:27.99,Default,,0000,0000,0000,,两个10就是20
Dialogue: 0,0:08:27.99,0:08:29.56,Default,,0000,0000,0000,,加7是27
Dialogue: 0,0:08:29.56,0:08:32.48,Default,,0000,0000,0000,,然后3×8=24
Dialogue: 0,0:08:32.48,0:08:34.45,Default,,0000,0000,0000,,3×8=24
Dialogue: 0,0:08:34.45,0:08:35.87,Default,,0000,0000,0000,,上边还有一个2的进位
Dialogue: 0,0:08:35.87,0:08:37.87,Default,,0000,0000,0000,,还要再加2
Dialogue: 0,0:08:37.88,0:08:39.43,Default,,0000,0000,0000,,得26
Dialogue: 0,0:08:39.44,0:08:41.67,Default,,0000,0000,0000,,3×8=24
Dialogue: 0,0:08:41.67,0:08:45.08,Default,,0000,0000,0000,,24+2=26
Dialogue: 0,0:08:45.09,0:08:48.64,Default,,0000,0000,0000,,结果是267
Dialogue: 0,0:08:48.64,0:08:49.82,Default,,0000,0000,0000,,再做一个
Dialogue: 0,0:08:49.83,0:08:52.18,Default,,0000,0000,0000,,不过我要加难度了
Dialogue: 0,0:08:52.18,0:08:54.40,Default,,0000,0000,0000,,在你觉得
Dialogue: 0,0:08:54.40,0:08:56.74,Default,,0000,0000,0000,,这些都会做的时候
Dialogue: 0,0:08:56.74,0:08:58.53,Default,,0000,0000,0000,,我再出一个能难到你的！
Dialogue: 0,0:08:58.53,0:09:02.18,Default,,0000,0000,0000,,239×6
Dialogue: 0,0:09:02.18,0:09:03.68,Default,,0000,0000,0000,,本来是要做
Dialogue: 0,0:09:03.68,0:09:10.16,Default,,0000,0000,0000,,两位数乘一位数的视频的
Dialogue: 0,0:09:10.16,0:09:10.90,Default,,0000,0000,0000,,不过这题也是告诉大家
Dialogue: 0,0:09:10.90,0:09:13.79,Default,,0000,0000,0000,,不管是几位数去乘一个一位数
Dialogue: 0,0:09:13.79,0:09:14.64,Default,,0000,0000,0000,,你都是可以做的
Dialogue: 0,0:09:14.64,0:09:18.36,Default,,0000,0000,0000,,步骤大同小异
Dialogue: 0,0:09:18.36,0:09:19.97,Default,,0000,0000,0000,,大家可以猜一猜这个要怎么做
Dialogue: 0,0:09:19.97,0:09:21.40,Default,,0000,0000,0000,,6×9=？
Dialogue: 0,0:09:21.40,0:09:24.49,Default,,0000,0000,0000,,在这里写
Dialogue: 0,0:09:24.50,0:09:27.83,Default,,0000,0000,0000,,6×9
Dialogue: 0,0:09:27.83,0:09:32.20,Default,,0000,0000,0000,,这个之前算过了
Dialogue: 0,0:09:32.20,0:09:34.14,Default,,0000,0000,0000,,54
Dialogue: 0,0:09:34.14,0:09:36.39,Default,,0000,0000,0000,,把4写在这
Dialogue: 0,0:09:36.40,0:09:38.79,Default,,0000,0000,0000,,5放在十位
Dialogue: 0,0:09:38.80,0:09:41.49,Default,,0000,0000,0000,,因为这个54中的5就是5个10
Dialogue: 0,0:09:41.49,0:09:43.80,Default,,0000,0000,0000,,好
Dialogue: 0,0:09:43.80,0:09:46.38,Default,,0000,0000,0000,,然后是6×3
Dialogue: 0,0:09:46.38,0:09:49.23,Default,,0000,0000,0000,,6×3
Dialogue: 0,0:09:49.23,0:09:52.61,Default,,0000,0000,0000,,得18
Dialogue: 0,0:09:52.61,0:09:57.35,Default,,0000,0000,0000,,上边还有一个5
Dialogue: 0,0:09:57.35,0:10:01.14,Default,,0000,0000,0000,,还要加5
Dialogue: 0,0:10:01.14,0:10:02.29,Default,,0000,0000,0000,,18+5=？
Dialogue: 0,0:10:02.30,0:10:03.49,Default,,0000,0000,0000,,6×3=18 18+5=23
Dialogue: 0,0:10:03.50,0:10:06.71,Default,,0000,0000,0000,,澄清一点
Dialogue: 0,0:10:06.71,0:10:08.32,Default,,0000,0000,0000,,并不是用6×3+5
Dialogue: 0,0:10:08.32,0:10:09.77,Default,,0000,0000,0000,,你看
Dialogue: 0,0:10:09.77,0:10:12.25,Default,,0000,0000,0000,,在这个问题里
Dialogue: 0,0:10:12.25,0:10:15.02,Default,,0000,0000,0000,,3其实是30
Dialogue: 0,0:10:15.02,0:10:17.36,Default,,0000,0000,0000,,只不过写的是3
Dialogue: 0,0:10:17.37,0:10:18.62,Default,,0000,0000,0000,,但这其实是6×30+50
Dialogue: 0,0:10:18.62,0:10:20.12,Default,,0000,0000,0000,,因为39的3是3个10 或者是30
Dialogue: 0,0:10:20.13,0:10:21.83,Default,,0000,0000,0000,,那么
Dialogue: 0,0:10:21.84,0:10:23.50,Default,,0000,0000,0000,,虽然这里说6×3=18
Dialogue: 0,0:10:23.50,0:10:25.50,Default,,0000,0000,0000,,18+5=23
Dialogue: 0,0:10:25.50,0:10:26.74,Default,,0000,0000,0000,,实际得到的其实是230
Dialogue: 0,0:10:26.74,0:10:29.09,Default,,0000,0000,0000,,把3放在十位
Dialogue: 0,0:10:29.09,0:10:35.21,Default,,0000,0000,0000,,我换个颜色来写
Dialogue: 0,0:10:35.21,0:10:38.20,Default,,0000,0000,0000,,用个跟上边不一样的
Dialogue: 0,0:10:38.20,0:10:40.98,Default,,0000,0000,0000,,结果是23
Dialogue: 0,0:10:40.98,0:10:42.87,Default,,0000,0000,0000,,把3放在十位
Dialogue: 0,0:10:42.87,0:10:46.62,Default,,0000,0000,0000,,向百位进2 写上边
Dialogue: 0,0:10:46.62,0:10:53.06,Default,,0000,0000,0000,,差不多就做完了 再乘最后一次
Dialogue: 0,0:10:53.06,0:10:53.81,Default,,0000,0000,0000,,6×2
Dialogue: 0,0:10:53.81,0:10:56.21,Default,,0000,0000,0000,,这个很简单
Dialogue: 0,0:10:56.22,0:10:58.32,Default,,0000,0000,0000,,得12
Dialogue: 0,0:10:58.32,0:10:59.90,Default,,0000,0000,0000,,但是上边还有进位2
Dialogue: 0,0:10:59.90,0:11:01.26,Default,,0000,0000,0000,,所以还要再加2
Dialogue: 0,0:11:01.26,0:11:03.38,Default,,0000,0000,0000,,+2
Dialogue: 0,0:11:03.39,0:11:06.20,Default,,0000,0000,0000,,等于什么呢？
Dialogue: 0,0:11:06.20,0:11:08.13,Default,,0000,0000,0000,,12+2=14
Dialogue: 0,0:11:08.14,0:11:10.12,Default,,0000,0000,0000,,写4
Dialogue: 0,0:11:10.13,0:11:13.96,Default,,0000,0000,0000,,6×2=12
Dialogue: 0,0:11:13.97,0:11:18.68,Default,,0000,0000,0000,,12+2=14
Dialogue: 0,0:11:18.68,0:11:20.84,Default,,0000,0000,0000,,把4写在下边
Dialogue: 0,0:11:20.84,0:11:23.25,Default,,0000,0000,0000,,如果这里还有更高位的话就写在上边
Dialogue: 0,0:11:23.27,0:11:27.14,Default,,0000,0000,0000,,但是没有了
Dialogue: 0,0:11:27.14,0:11:34.37,Default,,0000,0000,0000,,所以直接写在这就可以了
Dialogue: 0,0:11:34.37,0:11:36.35,Default,,0000,0000,0000,,239×6
Dialogue: 0,0:11:36.35,0:11:38.96,Default,,0000,0000,0000,,=1434
Dialogue: 0,0:11:38.96,0:11:40.71,Default,,0000,0000,0000,,再做一个
Dialogue: 0,0:11:40.71,0:11:44.16,Default,,0000,0000,0000,,需要清一些空间出来
Dialogue: 0,0:11:44.16,0:11:47.35,Default,,0000,0000,0000,,既然已经增加难度了
Dialogue: 0,0:11:47.36,0:11:50.46,Default,,0000,0000,0000,,下面来做一个四位数的吧
Dialogue: 0,0:11:50.46,0:11:52.03,Default,,0000,0000,0000,,7362×--
Dialogue: 0,0:11:52.03,0:11:54.55,Default,,0000,0000,0000,,难点的--9
Dialogue: 0,0:11:54.55,0:11:56.87,Default,,0000,0000,0000,,9×2=？
Dialogue: 0,0:11:56.87,0:12:00.49,Default,,0000,0000,0000,,我就不再写在旁边了
Dialogue: 0,0:12:00.49,0:12:05.02,Default,,0000,0000,0000,,大家应该已经明白这个套路了
Dialogue: 0,0:12:05.02,0:12:07.20,Default,,0000,0000,0000,,9×2=？