1
00:00:00,906 --> 00:00:05,224
將5又1/4寫為假分數

2
00:00:05,224 --> 00:00:07,779
讓我提醒你，假分數就是

3
00:00:07,779 --> 00:00:11,726
分子大於或等於分母

4
00:00:11,726 --> 00:00:17,624
分子的絕對值

5
00:00:17,624 --> 00:00:20,317
大於或等於

6
00:00:20,317 --> 00:00:34,807
分母的絕對值

7
00:00:36,711 --> 00:00:38,058
在這種情況下，我們有

8
00:00:38,058 --> 00:00:40,194
一個帶分數，整數部分為5

9
00:00:40,194 --> 00:00:43,723
1/4是一個真分數，因為它的分子

10
00:00:43,723 --> 00:00:49,621
小於分母

11
00:00:49,621 --> 00:00:54,219
所以，要寫成假分數

12
00:00:54,219 --> 00:00:55,380
我會教你方法

13
00:00:55,380 --> 00:01:02,067
5又1/4，方法很簡單

14
00:01:02,067 --> 00:01:09,126
5就等於20/4

15
00:01:09,126 --> 00:01:13,305
所以20/4 + 1/4 = 21/4

16
00:01:13,305 --> 00:01:17,624
另一個思考的方式是 5x4=20，加1，等於21

17
00:01:17,624 --> 00:01:21,533
所以，就是21/4

18
00:01:21,533 --> 00:01:29,792
你用帶分數或者你用

19
00:01:29,792 --> 00:01:32,067
帶分數的整數部分乘以分母

20
00:01:32,067 --> 00:01:35,782
再加上分子

21
00:01:35,782 --> 00:01:45,024
所以，讓我們看看為什麼這樣行得通

22
00:01:45,024 --> 00:01:50,132
讓我們看看5又1/4是什麼

23
00:01:50,132 --> 00:01:56,309
整數部分有5，這是一個整數

24
00:01:56,309 --> 00:02:05,667
讓我把它拷貝5次

25
00:02:05,667 --> 00:02:14,533
所以這是2、3、4、5

26
00:02:14,533 --> 00:02:30,867
我們有5個，然後還有1/4

27
00:02:30,867 --> 00:02:38,933
1/4是像這樣

28
00:02:43,000 --> 00:02:46,400
要寫成假分數

29
00:02:46,400 --> 00:02:54,200
將每個都分成一個個1/4

30
00:02:54,200 --> 00:03:02,533
這邊有4個1/4，4個1/4，4個1/4

31
00:03:02,533 --> 00:03:11,400
4個1/4。所以總共有多少個1/4

32
00:03:11,400 --> 00:03:25,000
我們有20個1/4，1/4是用綠色

33
00:03:25,000 --> 00:03:32,600
這就等於5

34
00:03:37,600 --> 00:03:48,733
然後我們再把它加上1/4

35
00:03:48,733 --> 00:03:59,200
所以我們得到21/4

36
00:03:59,200 --> 00:04:02,867
這解釋了為什麼這樣做的概念

37
00:04:02,867 --> 00:04:06,733
將整數部分乘以分母

38
00:04:06,733 --> 00:04:10,267
然後加上分子

39
00:04:10,267 --> 00:04:13,533
5又1/4 = 21/4

40
00:04:13,533 --> 00:04:19,400
5又1/4 = (5x4)+1/4