[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.64,0:00:04.16,Default,,0000,0000,0000,,我们现在来看一下分数的除法
Dialogue: 0,0:00:04.44,0:00:08.37,Default,,0000,0000,0000,,比如说我有负5/6
Dialogue: 0,0:00:08.52,0:00:15.99,Default,,0000,0000,0000,,除以3/4
Dialogue: 0,0:00:15.99,0:00:19.52,Default,,0000,0000,0000,,我们已经复习过除法
Dialogue: 0,0:00:19.52,0:00:22.94,Default,,0000,0000,0000,,这和乘以它的倒数是一样的
Dialogue: 0,0:00:22.97,0:00:32.52,Default,,0000,0000,0000,,所以，这和负5/6乘以3/4的倒数
Dialogue: 0,0:00:32.52,0:00:40.82,Default,,0000,0000,0000,,我只是把分子和分母倒一下
Dialogue: 0,0:00:40.82,0:00:47.08,Default,,0000,0000,0000,,我们已经谈过分数乘法，这次是分子相乘
Dialogue: 0,0:00:47.08,0:01:03.91,Default,,0000,0000,0000,,所以是-5乘以4。分母上是6乘以3
Dialogue: 0,0:01:03.91,0:01:09.94,Default,,0000,0000,0000,,现在分子上有一个负数。5乘以4是20
Dialogue: 0,0:01:09.94,0:01:13.53,Default,,0000,0000,0000,,你只要记住，现在是负数乘以正数
Dialogue: 0,0:01:13.53,0:01:21.00,Default,,0000,0000,0000,,这里其实有4个-5，等于-20
Dialogue: 0,0:01:21.00,0:01:27.14,Default,,0000,0000,0000,,所以分子是-20，分母是18
Dialogue: 0,0:01:27.14,0:01:30.32,Default,,0000,0000,0000,,答案是-20/18，但我们需要简化
Dialogue: 0,0:01:30.32,0:01:38.32,Default,,0000,0000,0000,,把分子和分母都除以2
Dialogue: 0,0:01:38.32,0:01:42.92,Default,,0000,0000,0000,,我们把分子和分母都除以2，来简化
Dialogue: 0,0:01:42.92,0:01:45.86,Default,,0000,0000,0000,,因为2是同时能被分子和分母除的数
Dialogue: 0,0:01:45.89,0:01:53.32,Default,,0000,0000,0000,,20除以2是10，18除以2是9
Dialogue: 0,0:01:53.32,0:02:02.22,Default,,0000,0000,0000,,所以5/6除以3/4。。
Dialogue: 0,0:02:02.22,0:02:07.46,Default,,0000,0000,0000,,
Dialogue: 0,0:02:07.46,0:02:09.73,Default,,0000,0000,0000,,
Dialogue: 0,0:02:09.73,0:02:24.33,Default,,0000,0000,0000,,
Dialogue: 0,0:02:24.33,0:02:30.14,Default,,0000,0000,0000,,
Dialogue: 0,0:02:30.14,0:02:36.73,Default,,0000,0000,0000,,
Dialogue: 0,0:02:36.73,0:02:41.22,Default,,0000,0000,0000,,
Dialogue: 0,0:02:41.22,0:02:45.14,Default,,0000,0000,0000,,
Dialogue: 0,0:02:45.14,0:02:51.73,Default,,0000,0000,0000,,
Dialogue: 0,0:02:51.73,0:02:56.82,Default,,0000,0000,0000,,
Dialogue: 0,0:02:56.82,0:03:05.28,Default,,0000,0000,0000,,
Dialogue: 0,0:03:05.28,0:03:08.26,Default,,0000,0000,0000,,
Dialogue: 0,0:03:08.26,0:03:13.46,Default,,0000,0000,0000,,
Dialogue: 0,0:03:13.46,0:03:19.22,Default,,0000,0000,0000,,
Dialogue: 0,0:03:19.22,0:03:29.37,Default,,0000,0000,0000,,
Dialogue: 0,0:03:29.37,0:03:34.100,Default,,0000,0000,0000,,
Dialogue: 0,0:03:34.100,0:03:42.32,Default,,0000,0000,0000,,
Dialogue: 0,0:03:42.32,0:04:00.26,Default,,0000,0000,0000,,
Dialogue: 0,0:04:00.26,0:04:04.26,Default,,0000,0000,0000,,