已知(x-y+1)²+|x+y+2|=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)的值
1个回答
2013-08-10
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(x-y+1)²+|x+y-2|=0
由非负性
x-y+1=0
x+y-2=0
解得
x=0.5
y=1.5
则
(x-y+ 4xy/x-y)(x+y- 4xy/x+y)
=(-1-4xy)(2-2xy)
=(-1-3)*(2-1.5)
=(-4)*0.5
=-2
望采纳哦~!!
~~~~~~~~~~~~~~~~~~~~~~~
不懂追问!!!
由非负性
x-y+1=0
x+y-2=0
解得
x=0.5
y=1.5
则
(x-y+ 4xy/x-y)(x+y- 4xy/x+y)
=(-1-4xy)(2-2xy)
=(-1-3)*(2-1.5)
=(-4)*0.5
=-2
望采纳哦~!!
~~~~~~~~~~~~~~~~~~~~~~~
不懂追问!!!
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