计算：x(x-3y)(5x-2y)还有（x^2-3)(x^2+5) x(x-3y)乘y
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计算：x(x-3y)(5x-2y)还有（x^2-3)(x^2+5)x(x-3y)乘y计算：x(x-3y)(5x-2y)还有（x^2-3)(x^2+5)x(x-3y)乘y计算：x(x-3y)(5x-2y
计算：x(x-3y)(5x-2y)还有（x^2-3)(x^2+5) x(x-3y)乘y
计算：x(x-3y)(5x-2y)
还有（x^2-3)(x^2+5) x(x-3y)乘y
计算：x(x-3y)(5x-2y)还有（x^2-3)(x^2+5) x(x-3y)乘y
解
x(x-3y)(5x-2y)
=x(5x²-2xy-15xy+6y²)
=x(5x²-17xy+6y²)
=5x³-17x²y+6xy²
(x²-3)(x²+5)
=x^4+5x²-3x²-15
=x^4+2x²-15
x(x-3y)×y
=(x²-3xy)y
=x²y-3xy²
(x-3y)(5x-2y)＝8x²－20xy＋12;
（2a-3)(4a-4)＝8a²－20a＋12
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