a+2b+(4b^2/a-2b)-(4a^2b/a^2-4b^2)
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a+2b+(4b^2/a-2b)-(4a^2b/a^2-4b^2)
答案是a^2/a-2b,
答案是a^2/a-2b,
![a+2b+(4b^2/a-2b)-(4a^2b/a^2-4b^2)](/uploads/image/z/18771837-69-7.jpg?t=a%2B2b%2B%284b%5E2%2Fa-2b%29-%284a%5E2b%2Fa%5E2-4b%5E2%29)
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)
=(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)
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