Maths question

👨🏻‍🏫 學術台數學

卓軒

2009-12-24 8:51 pm

It is given that 3a-5b/2a-b = 3
a) Find a : b
b) Find the value of b when a = 14.

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回答 (2)

wing hang

2009-12-24 9:22 pm

✔ 最佳答案

3a-5b/2a-b=3
3a-5b=3(2a-b)
3a-5b=6a-3b
3a-6a=-3b+5b
-3a=2b
a:b=2:-3 or -2:3

b)
a:b=2:-3
14:b=2:-3
14/b=2/(-3)
14(-3)/2=b
b=-21

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myisland8132

2009-12-24 9:00 pm

(a) (3a-5b)/(2a-b)=3
3a-5b=3(2a-b)
-3a=2b
a/b=-2/3 or a:b=2:-3

(b) when a=14,b=(-3/2)a=-21

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