WEBVTT

99:59:59.999 --> 99:59:59.999
0.8就是8/10 再化简得4/5

99:59:59.999 --> 99:59:59.999
8除以2是4 10除以2是5

99:59:59.999 --> 99:59:59.999
这样就做完了

00:00:02.762 --> 00:00:04.628
下面把0.8化成分数

NOTE Paragraph

00:00:04.628 --> 00:00:07.544
这个8是在十分位

00:00:07.544 --> 00:00:10.291
十分位上的8

00:00:10.291 --> 00:00:16.577
就是十分之八

00:00:16.577 --> 00:00:20.012
就可以写成8/10

00:00:20.012 --> 00:00:23.321
现在已经是分数的形式了

NOTE Paragraph

00:00:23.321 --> 00:00:26.570
还可以再化简一下

00:00:26.570 --> 00:00:29.272
很明显8和10有公因数

00:00:29.272 --> 00:00:39.773
它们都能被2整除

00:00:39.773 --> 00:00:43.294
分子分母同除以2

00:00:43.294 --> 00:00:47.589
这样分数的值不变

00:00:47.589 --> 00:00:51.139
因为分子和分母

00:00:51.139 --> 00:00:53.000
除以同一个数