[(a^2-2ab)/-ab+b^2]/[(a/a+b)/(2ab/2b-a)]
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解:原式=[(a²-2ab)/(-ab+b²)]÷{[a/(a+b)]÷[2ab/(2b-a)]}
={[a(a-2b)]/[-b(a-b)]}÷{[a/(a+b)]×[-(a-2b)/(2ab)]}
={[a(a-2b)/[-b(a-b)]}÷{-(a-2b)/[2b(a+b)]}
={[a(a-2b)/[-b(a-b)]}×[-2b(a+b)/(a-2b)]
=2a(a+b)/(a-b)
={[a(a-2b)]/[-b(a-b)]}÷{[a/(a+b)]×[-(a-2b)/(2ab)]}
={[a(a-2b)/[-b(a-b)]}÷{-(a-2b)/[2b(a+b)]}
={[a(a-2b)/[-b(a-b)]}×[-2b(a+b)/(a-2b)]
=2a(a+b)/(a-b)
追问
谢谢,我打错符号了,应是(a/a-b),最后答案为2A,可以再算算吗?
追答
你好:再算算!
原式=[(a²-2ab)/(-ab+b²)]÷{[a/(a-b)]÷[2ab/(2b-a)]}
={[a(a-2b)]/[-b(a-b)]}÷{[a/(a-b)]×[-(a-2b)/(2ab)]}
={[a(a-2b)]/[-b(a-b)]}÷{-(a-2b)/[2b(a-b)]}
={[a(a-2b)/[-b(a-b)]}×[-2b(a-b)/(a-2b)]
=2a
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