已知1/a-1/b=3,求代数式2a+3ab-2b/a-2ab-b的值
问题描述:
已知1/a-1/b=3,求代数式2a+3ab-2b/a-2ab-b的值
答
1/a-1/b=3,b-a=3ab ,(2a+3ab-2b)/(a-2ab-b)=(-6ab+3ab)/-3ab-2ab)=3/5
已知1/a-1/b=3,求代数式2a+3ab-2b/a-2ab-b的值
1/a-1/b=3,b-a=3ab ,(2a+3ab-2b)/(a-2ab-b)=(-6ab+3ab)/-3ab-2ab)=3/5