(-x+2y)(x+2y)-(2x-y)(-x-2y),其中x=8,y=-8(先化简,在求值.

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(-x+2y)(x+2y)-(2x-y)(-x-2y),其中x=8,y=-8(先化简,在求值.(-x+2y)(x+2y)-(2x-y)(-x-2y),其中x=8,y=-8(先化简,在求值.(-x+2y

(-x+2y)(x+2y)-(2x-y)(-x-2y),其中x=8,y=-8(先化简,在求值.
(-x+2y)(x+2y)-(2x-y)(-x-2y),其中x=8,y=-8(先化简,在求值.

(-x+2y)(x+2y)-(2x-y)(-x-2y),其中x=8,y=-8(先化简,在求值.
(-x+2y)(x+2y)-(2x-y)(-x-2y)
=(2y-x)(x+2y)+(2x-y)(x+2y)
=(x+2y)*(2y-x+2x-y)
=(x+2y)*(x+y)
=(x+2y)*(8-8)
=0

(-x+2y)(x+2y)-(2x-y)(-x-2y)
=(x+2y)[(-x+2y)+(2x-y)]
=(x+2y)(x+y)
=(8-16)*0
=0