a+2b+(4b^2/a-2b)-(4a^2b/a^2-4b^2)答案是a^2/a-2b,

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a+2b+(4b^2/a-2b)-(4a^2b/a^2-4b^2)答案是a^2/a-2b,a+2b+(4b^2/a-2b)-(4a^2b/a^2-4b^2)答案是a^2/a-2b,a+2b+(4b^2

a+2b+(4b^2/a-2b)-(4a^2b/a^2-4b^2)答案是a^2/a-2b,
a+2b+(4b^2/a-2b)-(4a^2b/a^2-4b^2)
答案是a^2/a-2b,

a+2b+(4b^2/a-2b)-(4a^2b/a^2-4b^2)答案是a^2/a-2b,
a+2b+(4b^2/a-2b)-(4a^2b/a^2-4b^2)
=(a+2b)(a-2b)/(a-2b)+4b²/(a-2b)-4a²b/(a+2b)(a-2b)
=[(a+2b)(a-2b)+4b²]/(a-2b)-4a²b/(a+2b)(a-2b)
=a²/(a-2b)-4a²b/(a+2b)(a-2b)
=a²(a+2b)/(a+2b)(a-2b)-4a²b/(a+2b)(a-2b)
=[a²(a+2b)-4a²b]/(a+2b)(a-2b)
=a²(a-2b)/(a+2b)(a-2b)
=a²/(a+2b)