计算(a^2-4b^2)/(a^2-ab)*(a-b)/(a^2-2ab)

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计算(a^2-4b^2)/(a^2-ab)*(a-b)/(a^2-2ab)计算(a^2-4b^2)/(a^2-ab)*(a-b)/(a^2-2ab)计算(a^2-4b^2)/(a^2-ab)*(a-b

计算(a^2-4b^2)/(a^2-ab)*(a-b)/(a^2-2ab)
计算(a^2-4b^2)/(a^2-ab)*(a-b)/(a^2-2ab)

计算(a^2-4b^2)/(a^2-ab)*(a-b)/(a^2-2ab)
(a^2-4b^2)/(a^2-ab)*(a-b)/(a^2-2ab)
=[(a+2b)(a-2b)/a(a-b)][(a-b)/a(a-2b)]
=(a+2b)(a-2b)(a-b)/[a(a-b)a(a-2b)]
=(a+2b)/a^2

=(a+2b)(a-2b)/a(a-b) * (a-b)/a(a-2b)
=(a+2b)/a^2