(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.
(b-a)÷AB=2,则(A-2AB-B)÷(2A-2B+7AB)=?
(b-a)÷AB=2,则(A-2AB-B)÷(2A-2B+7AB)=?
数学人气：323 ℃时间：2020-06-20 09:58:06
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