1
00:00:00,530 --> 00:00:04,900
让我们来算一下2/5除以7/3

2
00:00:04,900 --> 00:00:06,880
等于多少，我希望你能暂停视频

3
00:00:06,880 --> 00:00:09,340
然后尝试自己做一下。

4
00:00:09,340 --> 00:00:11,720
好了我们只需要提醒自己这

5
00:00:11,720 --> 00:00:21,130
其实就等同于2/5乘以

6
00:00:21,130 --> 00:00:26,120
7/3的倒数也就是3/7。

7
00:00:29,230 --> 00:00:30,830
然后再将两个分数相乘

8
00:00:30,830 --> 00:00:32,200
这是非常直接了当的做法。

9
00:00:32,200 --> 00:00:34,200
这就等于

10
00:00:34,200 --> 00:00:35,520
分子的乘积。

11
00:00:35,520 --> 00:00:44,710
所以2乘以3除以分母的乘积，

12
00:00:44,710 --> 00:00:54,380
除以5乘以7——我想让颜色保持一致——

13
00:00:54,380 --> 00:00:59,780
当然这就等于2乘以3

14
00:00:59,780 --> 00:01:02,210
等于6了。

15
00:01:02,210 --> 00:01:05,590
然后5乘以7——我用另一个颜色来写，我们来看一下，

16
00:01:05,590 --> 00:01:10,320
我还没有用过这种蓝色呢——5乘以7当然

17
00:01:10,320 --> 00:01:12,250
就等于35了。

18
00:01:12,250 --> 00:01:14,966
所以这等于6/35。