（2x-2y)(?)=2y^2-2x^2 请说出来解题步骤
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（2x-2y)(?)=2y^2-2x^2请说出来解题步骤（2x-2y)(?)=2y^2-2x^2请说出来解题步骤（2x-2y)(?)=2y^2-2x^2请说出来解题步骤(2y^2-2x^2)/（2x-
（2x-2y)(?)=2y^2-2x^2 请说出来解题步骤
（2x-2y)(?)=2y^2-2x^2 请说出来解题步骤
（2x-2y)(?)=2y^2-2x^2 请说出来解题步骤
(2y^2-2x^2)/（2x-2y)=2(y^2-x^2 )/2(x-y)=2(y+x)(y-x)/2(x-y)=
∴（2x-2y)（y+x ）=2y^2-2x^2
右端=2（Y-X)(Y+X)
左端=-2（Y-X)
右/左=-X-Y
∴“？”处为（-X-Y）
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x+y>=2,x-y
x+y>=2,x-y