Question

分解因式两题

1.-x^4+x^2y^2
2.2a(b-c)+3d(c-b)

Answer 1

1.-x^4+x^2y^2
=（xy+x^2)(xy-x^2)
=x^2(x+y)(y-x)

2.2a(b-c)+3d(c-b)
=(2a-3d)(b-c)

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Answer 2

1.-x^4+x^2y^2
=x²﹙y²－x²﹚
=x²﹙y+x)(y-x)
2. 2a(b-c)+3d(c-b)
=2a(b-c)-3d(b-c)
=(b-c)(2a-3d)