当2a+3b/a-b=-3,求代数式[2(2a+3b)/a-b]-[3(a-b)/2a+3b]的值.

问题描述:

当2a+3b/a-b=-3,求代数式[2(2a+3b)/a-b]-[3(a-b)/2a+3b]的值.

2(2a+3b)/a-b]-[3(a-b)/2a+3b=4a+6b/a-b】-[3a-3b/2a+3b]=(4a+6b乘以2a+3b/a-b乘以2a+3b)-(3a-3b乘以a-b/2a+3b乘以a-b)=2(2a+3b)2-3(a-b)2/a-b乘以2a+3b因为2a+3b/a-b=-3,所以2a+3b=-3(a-b)带入就是=2(-3(a-...