因式分解:-a的3次方+2a²b-ab² (a²+4)²-16a²
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因式分解:-a的3次方+2a²b-ab² (a²+4)²-16a²
因式分解:-a的3次方+2a²b-ab² (a²+4)²-16a²
因式分解:-a的3次方+2a²b-ab² (a²+4)²-16a²
-a^3+2a^2b-ab^2
=-a(a^2-2ab+b^2)
=-a(a-b)^2
(a^2+4)^2-16a^2
=(a^2+4)^2-(4a)^2
=(a^2+4-4a)(a^2+4+4a)
=(a-2)^2(a+2)^2