1
99:59:59,999 --> 99:59:59,999
0.8就是8/10 再化简得4/5

2
99:59:59,999 --> 99:59:59,999
8除以2是4 10除以2是5

3
99:59:59,999 --> 99:59:59,999
这样就做完了

4
00:00:02,762 --> 00:00:04,628
下面把0.8化成分数

5
00:00:04,628 --> 00:00:07,544
这个8是在十分位

6
00:00:07,544 --> 00:00:10,291
十分位上的8

7
00:00:10,291 --> 00:00:16,577
就是十分之八

8
00:00:16,577 --> 00:00:20,012
就可以写成8/10

9
00:00:20,012 --> 00:00:23,321
现在已经是分数的形式了

10
00:00:23,321 --> 00:00:26,570
还可以再化简一下

11
00:00:26,570 --> 00:00:29,272
很明显8和10有公因数

12
00:00:29,272 --> 00:00:39,773
它们都能被2整除

13
00:00:39,773 --> 00:00:43,294
分子分母同除以2

14
00:00:43,294 --> 00:00:47,589
这样分数的值不变

15
00:00:47,589 --> 00:00:51,139
因为分子和分母

16
00:00:51,139 --> 00:00:53,000
除以同一个数