0:00:00.000,0:00:00.500
计算-15+(-46)+(-29)的总和

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现在我们来把她们形象化

0:00:01.000,0:00:03.312
每一个数字代表什么意思呢？

0:00:03.312,0:00:06.625
那就让我来为她们各自画一条带数字的线吧。

0:00:06.625,0:00:08.471
-15看起来就像这个样子。

0:00:08.471,0:00:10.115
如果这儿是0，那我们可以说这儿是-15。

0:00:10.115,0:00:12.497
我可以把-15用一个从0到-15的箭头来表示。

0:00:12.497,0:00:15.649
箭头的长度就是这个数的绝对值。

0:00:15.649,0:00:21.031
她代表的是从0到-15的距离。

0:00:21.031,0:00:28.087
所以长度就是15

0:00:28.087,0:00:31.698
负号的意思就是我们的箭头指向左边。

0:00:31.698,0:00:33.344
所以绝对值是15。

0:00:33.344,0:00:36.129
这也是箭头的长度。

0:00:36.129,0:00:39.254
让我们用同样的方法来表示-46。

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我再画了一条带数字的线。

0:00:42.070,0:00:43.647
我们把0定在这里。

0:00:43.647,0:00:45.645
-46就将是在这里哦。

0:00:45.645,0:00:53.044
注意相同的概念。

0:00:53.044,0:00:55.580
-46与0之间的距离。

0:00:55.580,0:00:59.924
另一种思路就是-46的绝对值。

0:00:59.924,0:01:02.154
这一段的距离是46。

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-15+(-46)+(-29)的总和是多少呢？

0:05:23.623,0:05:27.401
想要算出结果，就让我们把这三个数形象化。

0:05:27.401,0:05:32.093
每一个数字代表什么意思呢？

0:05:32.093,0:05:35.600
那就让我来为她们各自画一条带数字的线吧。

0:05:35.600,0:05:40.918
-15看起来就像这个样子。

9:59:59.000,9:59:59.000


9:59:59.000,9:59:59.000
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