[(a+b)/(a-b)]^2乘以[(2a-2b)/(3a+3b)]-[a^2/(a^2-b^2)]/(a/b)

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[(a+b)/(a-b)]^2乘以[(2a-2b)/(3a+3b)]-[a^2/(a^2-b^2)]/(a/b)[(a+b)/(a-b)]^2乘以[(2a-2b)/(3a+3b)]-[a^2/(a^2

[(a+b)/(a-b)]^2乘以[(2a-2b)/(3a+3b)]-[a^2/(a^2-b^2)]/(a/b)
[(a+b)/(a-b)]^2乘以[(2a-2b)/(3a+3b)]-[a^2/(a^2-b^2)]/(a/b)

[(a+b)/(a-b)]^2乘以[(2a-2b)/(3a+3b)]-[a^2/(a^2-b^2)]/(a/b)
原式=[(a+b)²/(a-b)²]×[2(a-b)/3(a+b)]-a²/(a+b)(a-b)×b/a
=2(a+b)/3(a-b)-ab/(a+b)(a-b)
=[(2a+2b)(a+b)-3ab]/3(a+b)(a-b)
=(2a²+4ab+2b²-3ab)/(3a²-3b²)
=(2a²+ab+2b²)/(3a²-3b²)