(X+y-3)2+(X-Y+6)2=0,则X2-Y2的值为()
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(X+y-3)2+(X-Y+6)2=0,则X2-Y2的值为()(X+y-3)2+(X-Y+6)2=0,则X2-Y2的值为()(X+y-3)2+(X-Y+6)2=0,则X2-Y2的值为()(X+y-3)
(X+y-3)2+(X-Y+6)2=0,则X2-Y2的值为()
(X+y-3)2+(X-Y+6)2=0,则X2-Y2的值为()
(X+y-3)2+(X-Y+6)2=0,则X2-Y2的值为()
(X+y-3)2+(X-Y+6)2=0
由于平方数的值为非负数
题中说明 x+y-3=0 而且 x-y+6=0
解得 x=-3/2 y=9/2
x^2-y^2=(x+y)(x-y)= 3*(-6)=-12
X+Y-3=0 X-Y+6=0 X+Y=3 X-Y=-6
X^2-Y^2=(X+Y)*(X-Y)=-18
回楼上，3*（-6）不是=-18吗？
由(X+y-3)²+(X-Y+6)²=0得，x+y-3=0,x-y+6=0,解得x=-3/2,y=9/2,所以X2-Y2=9/4-81/4=-18
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
（x+y）/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
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6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
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