小五數學科
回答 (5)
2012-12-02 2:41 am
第一次用去的是：1*1/2=1/2
剩下：1-1/2=1/2
第二次：1/2*2/3= 1/3
剩下：1-1/2=1/2
第二次：1/2*2/3= 1/3
2012-12-01 2:06 am
Hello!
I hope my answer can help you!
列式:
(1 - 1 x 1/2 x 1/2) x 2/3
=(1 - 1/2x1/2) x 2/3
=(1 - 1/4) x 2/3
= 3/4 x 2/3
=1/2
=C
==> The answer is C (1/2)
The next time, if you have any problems, you can ask me.
I hope my answer can help you!
列式:
(1 - 1 x 1/2 x 1/2) x 2/3
=(1 - 1/2x1/2) x 2/3
=(1 - 1/4) x 2/3
= 3/4 x 2/3
=1/2
=C
==> The answer is C (1/2)
The next time, if you have any problems, you can ask me.
參考: By myself
2012-12-01 1:47 am
第一次用去半條的1/2
則第一次用去的長度
= 1 x 1/2 x 1/2 m
= 1/4 m
第一次用完後剩下
= 1 - 1/4 m
= 3/4m
第二次用去剩下的2/3
則第二次用去的長度
= 3/4 x 2/3 m
= 1/2 m
所以 答案 = 1/2 m = C.
則第一次用去的長度
= 1 x 1/2 x 1/2 m
= 1/4 m
第一次用完後剩下
= 1 - 1/4 m
= 3/4m
第二次用去剩下的2/3
則第二次用去的長度
= 3/4 x 2/3 m
= 1/2 m
所以 答案 = 1/2 m = C.
參考: 自己
2012-12-01 1:41 am
長1CM 第一次用去半條的1/2即系0.5乘1/2=0.25
條絲帶得返0.75CM(0.5+0.25)
0.75乘2/3=0.5
0.75-0.5=0.25即系1/4
答案系B
條絲帶得返0.75CM(0.5+0.25)
0.75乘2/3=0.5
0.75-0.5=0.25即系1/4
答案系B
2012-12-01 1:27 am
1*1/2*2/3=
=0.5*2/3
=1/3(cm)
2012-11-30 17:28:01 補充：
*=x
=0.5*2/3
=1/3(cm)
2012-11-30 17:28:01 補充：
*=x
收錄日期: 2021-04-13 19:09:00
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20121130000051KK00216