A和B的和是100
求A的值!!
(a) A:B = 1 : 3
(b) B : A = 3 : 2
Mathe~~數學
2013-10-20 5:27 am
回答 (6)
2013-10-20 5:37 am
✔ 最佳答案
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要求： A + B = 100
(a) A : B = 1 : 3
可以令 A = k, B = 3k, k 為非零常數
A + B = 100
k + 3k = 100
4k = 100
k = 25
A = k = 25
(b) A : B = 2 : 3
可以令 A = 2k, B = 3k, k 為非零常數
A + B = 100
2k + 3k = 100
5k = 100
k = 20
A = 2k = 40
2013-10-22 6:39 am
(a) A:B = 1 : 3
假設 A = n, B = 3 n
A + B = 100
n + 3 n = 100
4 n = 100
n = 25
A = 25
(b) A : B = 2 : 3
假設 A = 2 n, B = 3 n
A + B = 100
2 n + 3 n = 100
5 n = 100
n = 20
2 n = 40
A = 40
假設 A = n, B = 3 n
A + B = 100
n + 3 n = 100
4 n = 100
n = 25
A = 25
(b) A : B = 2 : 3
假設 A = 2 n, B = 3 n
A + B = 100
2 n + 3 n = 100
5 n = 100
n = 20
2 n = 40
A = 40
2013-10-22 6:08 am
2 4 9 17 28 42 的通項是什麼?
2 4 9 17 28 42 general term?
2 4 9 17 28 42 general term?
2013-10-20 6:56 am
A + B = 100
(a) A:B = 1 : 3
假設 A = n, B = 3 n
A + B = 100
n + 3 n = 100
4 n = 100
n = 25
A = 25
(b) A : B = 2 : 3
假設 A = 2 n, B = 3 n
A + B = 100
2 n + 3 n = 100
5 n = 100
n = 20
2 n = 40
A = 40
希望幫到你！
(a) A:B = 1 : 3
假設 A = n, B = 3 n
A + B = 100
n + 3 n = 100
4 n = 100
n = 25
A = 25
(b) A : B = 2 : 3
假設 A = 2 n, B = 3 n
A + B = 100
2 n + 3 n = 100
5 n = 100
n = 20
2 n = 40
A = 40
希望幫到你！
參考: 親筆書寫，絕無抄人
2013-10-20 6:15 am
A和B的和是100
即是A + B = 100
(a) A:B = 1 : 3
假設 A = n, B = 3 n
A + B = 100
n + 3 n = 100
4 n = 100
n = 25
A = 25
(b) A : B = 2 : 3
假設 A = 2 n, B = 3 n
A + B = 100
2 n + 3 n = 100
5 n = 100
n = 20
2 n = 40
A = 40
即是A + B = 100
(a) A:B = 1 : 3
假設 A = n, B = 3 n
A + B = 100
n + 3 n = 100
4 n = 100
n = 25
A = 25
(b) A : B = 2 : 3
假設 A = 2 n, B = 3 n
A + B = 100
2 n + 3 n = 100
5 n = 100
n = 20
2 n = 40
A = 40
參考: 自己
2013-10-20 5:35 am
(a) A:B = 1 : 3
A/B = 1/3
3A = B
A+B = 100
咁 ......
(b)
B/A = 3/2
咁 ......
A/B = 1/3
3A = B
A+B = 100
咁 ......
(b)
B/A = 3/2
咁 ......
收錄日期: 2021-04-27 20:34:26
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20131019000051KK00236