作业帮x+y=5,则（-x^2-y^2/2xy）^2除以（x-y/-xy）^2的值是多少?
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x+y=5,则（-x^2-y^2/2xy）^2除以（x-y/-xy）^2的值是多少?
x+y=5,则（-x^2-y^2/2xy）^2除以（x-y/-xy）^2的值是多少?
x+y=5,则（-x^2-y^2/2xy）^2除以（x-y/-xy）^2的值是多少?
25/4
x+y=5, x=5-y,
(x+y)²=25, x²+y²=25-2xy,
x²+y²-2xy=25-4xy, (x-y)²=25-4xy,
则（-x^2-y^2/2xy）^2除以（x-y/-xy）^2
＝【（x^2+y^2/2xy）×（xy/x-y）】^2
＝【(x²+y²)/2(x-y)】²
＝(25-2xy)²/[4(25-4xy)]
＝
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