(3x+y):(5x-y) = 17:15
求x:y?
(a-b):(b-2a) 2:3
a:b=?
請列式
幫忙解答變分題目
2009-10-03 10:29 am
回答 (1)
2009-10-03 11:56 am
✔ 最佳答案
(3x+y):(5x-y) = 17:1515(3x+y) = 17(5x - y)
45x + 15y = 85x - 17y
40x = 32y
x/y = 32/40
x : y = 4 : 5
(a-b):(b-2a) 2:3
3(a-b) = 2(b-2a)
3a - 3b = 2b - 4a
7a = 5b
a : b = 5 : 7
收錄日期: 2021-04-21 22:02:52
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https://hk.answers.yahoo.com/question/index?qid=20091003000051KK00190