因式分解:(1)ma²-18ma-40m (2)x³-5x²y-24xy²
问题描述:
因式分解:(1)ma²-18ma-40m (2)x³-5x²y-24xy²
急用
答
(1)ma²-18ma-40m=m(a-20)(a+2)
(2)x³-5x²y-24xy²=x(x²-5xy-24y²)=x(x-8y)(x+3y)