已知a/1-b/1=5,求3a+2ab-3b/a-4ab-b的值
问题描述:
已知a/1-b/1=5,求3a+2ab-3b/a-4ab-b的值
答
求3a+2ab-3b/a-4ab-b
答
1/a-1/b=5
b/ab-a/ab=5
b-a=5ab
a-b=-5ab
(3a+2ab-3b)/(a-4ab-b)
=(-15ab+2b)/(-5ab-4ab)
=-13/-9
=13/9