WEBVTT

00:00:00.397 --> 00:00:05.290
我們來把0.8寫成分數

NOTE Paragraph

00:00:05.290 --> 00:00:08.565
所以0.8...那個8

00:00:08.565 --> 00:00:12.421
事第十位事第十位所以可以讀

00:00:12.421 --> 00:00:15.959
為第8十我們可以寫為

00:00:15.959 --> 00:00:19.104
當8等於十位數

00:00:19.104 --> 00:00:22.664
或8/10 現在我們已經寫成那樣

NOTE Paragraph

00:00:22.664 --> 00:00:25.299
一個分數我們要簡化

00:00:25.299 --> 00:00:29.687
8和10有共同分數都可以被2除

00:00:29.687 --> 00:00:38.751
所以我們來把兩個都除以2吧

00:00:38.751 --> 00:00:41.264
8除以2等於4

00:00:41.264 --> 00:00:45.934
10除以2等於5

00:00:45.934 --> 00:00:50.513
0.8是一樣的8十位是相同東西

00:00:50.513 --> 00:00:53.000
4