Question

分解因式:(1)a³-4a (2)(x²+y²)²-4x²y²

Answer 1

a³-4a

=a(a²-4)

=a(a+2)(a-2)

(x²+y²)²-4x²y²

=x^4+2x²y²+y^4-4x²y²

=(x²-y²)²

=（x²+y²)²(x²-y²)²

(a+b)²-10a-10b+25

=(a+b)²-10(a+b)+25

=(a+b-5)²

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