因式分解9x³-25xy²
问题描述:
因式分解9x³-25xy²
(1)4x³y+4x²y²+xy³
(2)9x³-25xy²
答
(1)4x³y+4x²y²+xy³
=xy(4x²+4xy+y²)
=xy(2x+y)²(2)9x³-25xy²
=x(9x²-25y²)
=x(3x+5y)(3x-5y)