因式分解:(1)ma²-18ma-40m (2)x³-5x²y-24xy²急用
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因式分解:(1)ma²-18ma-40m (2)x³-5x²y-24xy²急用
因式分解:(1)ma²-18ma-40m (2)x³-5x²y-24xy²
急用
因式分解:(1)ma²-18ma-40m (2)x³-5x²y-24xy²急用
(1)ma²-18ma-40m=m(a-20)(a+2)
(2)x³-5x²y-24xy²=x(x²-5xy-24y²)=x(x-8y)(x+3y)
(1)原式=m(a²-18a-40)=m(a-20)(a+2)
(2)原式=x(x²-5xy-24y²)=x(x-8y)(x+3y)