已知a-b/b=2/3,求a/b-3a ,3a+2b/2a-3b

首页/题库/209℃/2024-08-03 17:47:33

优质解答：

a-b/b=2/3

a/b-1=2/3

a/b=5/3

a=5b/3

a/(b-3a)

=(5b/3)/(b-3*5b/3)

=-5/12

(3a+2b)/(2a-3b)

=(3*5b/3+2b)/(2*5b/3-3b)

=7b/(b/3)

=21

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