1
00:00:00,397 --> 00:00:05,290
我們來把0.8寫成分數

2
00:00:05,290 --> 00:00:08,565
所以0.8...那個8

3
00:00:08,565 --> 00:00:12,421
事第十位事第十位所以可以讀

4
00:00:12,421 --> 00:00:15,959
為第8十我們可以寫為

5
00:00:15,959 --> 00:00:19,104
當8等於十位數

6
00:00:19,104 --> 00:00:22,664
或8/10 現在我們已經寫成那樣

7
00:00:22,664 --> 00:00:25,299
一個分數我們要簡化

8
00:00:25,299 --> 00:00:29,687
8和10有共同分數都可以被2除

9
00:00:29,687 --> 00:00:38,751
所以我們來把兩個都除以2吧

10
00:00:38,751 --> 00:00:41,264
8除以2等於4

11
00:00:41,264 --> 00:00:45,934
10除以2等於5

12
00:00:45,934 --> 00:00:50,513
0.8是一樣的8十位是相同東西

13
00:00:50,513 --> 00:00:53,000
4