有數學題唔識do
回答 (9)
2006-10-25 6:03 am
✔ 最佳答案
7u-﹝(4u-1)/2﹞=21 14u - 4u + 1 = 42
10u = 41
u = 4.1
2006-10-25 8:01 am
7u - ((4u-1)/2) = 21
7u - 21 = (4u-1)/2
(7u - 21) x 2 = 4u - 1
14u - 42 = 4u - 1
14u - 4u = -1 + 42
10u = 41
u = 41/10
u = 4.1
7u - 21 = (4u-1)/2
(7u - 21) x 2 = 4u - 1
14u - 42 = 4u - 1
14u - 4u = -1 + 42
10u = 41
u = 41/10
u = 4.1
2006-10-25 7:07 am
4u - 1
7u - ──── = 21
2
14u - (4u-1) = 42
10u+1 = 42
10u = 41
u = 4.1
7u - ──── = 21
2
14u - (4u-1) = 42
10u+1 = 42
10u = 41
u = 4.1
2006-10-25 6:57 am
7u-﹝(4u-1)/2﹞=21
2* {7u-﹝(4u-1)/2﹞} = 21*2
14u - (4u-1) = 42
14u - 4u + 1 = 42
10u = 42 - 1
10u = 41
u = 4.1
2* {7u-﹝(4u-1)/2﹞} = 21*2
14u - (4u-1) = 42
14u - 4u + 1 = 42
10u = 42 - 1
10u = 41
u = 4.1
2006-10-25 6:11 am
解:7u-﹝(4u-1)/2﹞=21
7u-(4u-1)=10.5
7u-4u+1=10.5
3u=9.5
u=95/30
2006-10-24 22:17:03 補充：
````````````````````````````````````````````以下的才對7u-﹝(4u-1)/2﹞=21 14u-(4u-1)=4214u-4u+1=4210u=41u=4.1
7u-(4u-1)=10.5
7u-4u+1=10.5
3u=9.5
u=95/30
2006-10-24 22:17:03 補充：
````````````````````````````````````````````以下的才對7u-﹝(4u-1)/2﹞=21 14u-(4u-1)=4214u-4u+1=4210u=41u=4.1
2006-10-25 6:05 am
7u-﹝(4u-1)/2﹞=21
7u -21 = (4u-1)/2
2(7u-21) = 4u-1
14u-42 = 4u-1
14u-4u=42-1
10u=41
u =4.1
7u -21 = (4u-1)/2
2(7u-21) = 4u-1
14u-42 = 4u-1
14u-4u=42-1
10u=41
u =4.1
參考: 自己計
2006-10-25 6:05 am
-[(4u-1)/2] = 21-7u
4u-1=14u-42
10u=41
u=4.1
4u-1=14u-42
10u=41
u=4.1
收錄日期: 2021-04-13 13:42:30
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061024000051KK04484