已知:a/(a-b)=2,求(a^2+ab)(a-5b)/(a-b)(a^2-5ab)的值
急,在线等!
a/(a-b)=2
a=2a-b
a=b
(a^2+ab)(a-5b)/(a-b)(a^2-5ab)
=a(a+b)(a-5b)/(a-b)a(a-5b)
=a(a+b)/(a-b)
分母为0
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