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)
=x³-8x²y+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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