（2x-y)(y+2x)-(2y+x)(x+2y) 其中x=-1 y=2
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（2x-y)(y+2x)-(2y+x)(x+2y)其中x=-1y=2（2x-y)(y+2x)-(2y+x)(x+2y)其中x=-1y=2（2x-y)(y+2x)-(2y+x)(x+2y)其中x=-1y
（2x-y)(y+2x)-(2y+x)(x+2y) 其中x=-1 y=2
（2x-y)(y+2x)-(2y+x)(x+2y) 其中x=-1 y=2
（2x-y)(y+2x)-(2y+x)(x+2y) 其中x=-1 y=2
解（2x-y)(y+2x)-(2y+x)(x+2y)
=（2x-y)(2x+y)-(x+2y)^2
=4x^2-y^2-(x^2+4y^2+4xy)
=3x^2-5y^2-4xy
=3(-1)^2-5(2)^2-4(-1)*2
=3-20-4
=-21
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