计算 x(x-3y)(x-5y)
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计算x(x-3y)(x-5y)计算x(x-3y)(x-5y)计算x(x-3y)(x-5y)x(x-3y)(x-5y)=x(x²-8xy+15y²）=x³-8x²
计算 x(x-3y)(x-5y)
计算 x(x-3y)(x-5y)
计算 x(x-3y)(x-5y)
x(x-3y)(x-5y)
=x(x²-8xy+15y²）
=x³-8x²y+15xy²
x(x-3y)(x-5y)
=x（x^2-8xy+15y^2）
=x^3-8x^2y+15xy^2
原式=(x²－3xy)(x－5y)
=x³－5x²y－3x²y＋15xy²
=x³－8x²y＋15xy²
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