Question

分解因式∶⑴xy²-4x= ⑵x²-9= ⑶x²-4= ⑷x³y-2x²

Answer 1

⑴xy²-4x=x(y+2)(y-2)

⑵x²-9=(x-3)(x+3)

⑶x²-4=(x-2)(x+2)

⑷x³y-2x²y²+xy³=xy(x-y)(x-y)

⑸2x²-12x+18=2(x-3)(x-3)

⑹xy²-4x=x(y-2)(y+2)

⑺x²y-4y=y(x-2)(x+2)