(x-2y)(x+y)-2x(-2x-3y)+6x(-x-y),其中x=-1,y=2
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(x-2y)(x+y)-2x(-2x-3y)+6x(-x-y),其中x=-1,y=2(x-2y)(x+y)-2x(-2x-3y)+6x(-x-y),其中x=-1,y=2(x-2y)(x+y)-2x(-
(x-2y)(x+y)-2x(-2x-3y)+6x(-x-y),其中x=-1,y=2
(x-2y)(x+y)-2x(-2x-3y)+6x(-x-y),其中x=-1,y=2
(x-2y)(x+y)-2x(-2x-3y)+6x(-x-y),其中x=-1,y=2
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