计算3xy(x²y-xy²+xy)-xy²(2x²-xy+2x)
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3xy(x²y-xy²+xy)-xy²(2x²-xy+2x)
= xy( 3(x²y-xy²+xy) - y(2x²-xy+2x))
= xy( 3x²y - 3xy² + 3xy - 2x²y + xy² - 2xy)
= xy( x²y - 2xy² + xy)
= x²y²(x - 2y + 1)
= xy( 3(x²y-xy²+xy) - y(2x²-xy+2x))
= xy( 3x²y - 3xy² + 3xy - 2x²y + xy² - 2xy)
= xy( x²y - 2xy² + xy)
= x²y²(x - 2y + 1)
追问
那(x-1)(x²-4x+3)-x(x²-5x+2)等于多少
追答
(x-1)(x²-4x+3)-x(x²-5x+2)
= x(x²-4x+3) - (x²-4x+3) - x(x²-5x+2)
= x( x²-4x+3 - (x²-5x+2)) - (x²-4x+3x)
= x(x + 1 ) - (x²-4x+3)
= x² + x - (x²-4x+3)
= 5x - 3
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