(2x-y)(y+2x)+2(3x+2y)(3x-2y)-(11x-3y)(2x+3y)其中x=1,y=-2

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(2x-y)(y+2x)+2(3x+2y)(3x-2y)-(11x-3y)(2x+3y)其中x=1,y=-2
(2x-y)(y+2x)+2(3x+2y)(3x-2y)-(11x-3y)(2x+3y)其中x=1,y=-2

(2x-y)(y+2x)+2(3x+2y)(3x-2y)-(11x-3y)(2x+3y)其中x=1,y=-2
您好：

(2x-y)(y+2x)+2(3x+2y)(3x-2y)-(11x-3y)(2x+3y)
=4x²-y²+18x²-8y²-22x²-27xy+9y²
=-27xy
=-27x1x(-2)
=54

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=2xy+4x^2-y^2-xy+2(9x^2-4y^2)-(22x^2+33xy-6xy-9y^2)
=4x²-y²+18x²-8y²-22x²-27xy+9y²
=-27xy
=-27x1x(-2)
=54

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