(b-a)÷AB=2,则(A-2AB-B)÷(2A-2B+7AB)=?
问题描述:
(b-a)÷AB=2,则(A-2AB-B)÷(2A-2B+7AB)=?
答
(B-A)÷AB=2,
B-A=2AB,
(A-2AB-B)÷(2A-2B+7AB)
=[-(B-A)-2AB]÷[-2(B-A)+7AB]
=(-2AB-2AB)÷(-2*2AB+7AB)
=(=4AB)÷(3AB)
=-4/3.