(x-5y)(﹣x-5y)-(﹣x+5y)²,其中x=﹣1,y=0.5

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(x-5y)(﹣x-5y)-(﹣x+5y)²,其中x=﹣1,y=0.5(x-5y)(﹣x-5y)-(﹣x+5y)²,其中x=﹣1,y=0.5(x-5y)(﹣x-5y)-(﹣x+5y

(x-5y)(﹣x-5y)-(﹣x+5y)²,其中x=﹣1,y=0.5
(x-5y)(﹣x-5y)-(﹣x+5y)²,其中x=﹣1,y=0.5

(x-5y)(﹣x-5y)-(﹣x+5y)²,其中x=﹣1,y=0.5
(x-5y)(-x-5y)-(-x+5y)²
=(x-5y)(-x-5y)-(x-5y)²
=(x-5y)[(-x-5y)-(x-5y)]
=-2x(x-5y)
=(-2)×(-1)×(-1-5×0.5)
=2×(-3.5)
=-7

将x=-1 y=0.5代进去
得(-1-5*0.5)(-(-1)-5*0.5)-(-(-1)+5*0.5)^2
=3.5*1.5-3.5^2
=-7

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