(x-2y)(x+2y)-(x-2y)ˇ2,其中x=-2,y=二分之一
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(x-2y)(x+2y)-(x-2y)ˇ2,其中x=-2,y=二分之一(x-2y)(x+2y)-(x-2y)ˇ2,其中x=-2,y=二分之一(x-2y)(x+2y)-(x-2y)ˇ2,其中x=-2,y
(x-2y)(x+2y)-(x-2y)ˇ2,其中x=-2,y=二分之一
(x-2y)(x+2y)-(x-2y)ˇ2,其中x=-2,y=二分之一
(x-2y)(x+2y)-(x-2y)ˇ2,其中x=-2,y=二分之一
(x-2y)(x+2y)-(x-2y)ˇ2,
=x²-4y²-x²+4xy-4y²
=4xy-8y²
当x=-2,y=1/2时
原式=-4-2
=-6
(x-2y)(x+2y)-(x-2y)ˇ2
=(x-2y)(x+2y-x+2y)
=(x-2y)4y
=(-2-1)2
=-6
=(x-2y)(x+2y-x+2y)=4y(x-2y)=4xy-8y^2=4*(-2)*1/2-8*1/2*1/2=-6
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