若x2-y2=6,x+y=3,则x-y=
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若x2-y2=6,x+y=3,则x-y=
若f(x+y,x-y)=x2-y2,则f(x,y)=,
若x2+4x+y2-6y+13=0则x=?y=?
若x+y=6,x2-y2=48,则x-y=_____
若x-y=3,x2+y2=13/2,则x+y=
若x+y=3 ,x2-y2=24,则x-y=
若X2+2X+Y2-6Y+10=0,则X+Y=?
若x+y=6,x-y=4则y2-x2
(X+y-3)2+(X-Y+6)2=0,则X2-Y2的值为()
已知:x2-y2=16,x+y=2,求:3x-3y/y2-x2+x2-2xy+y2/x2-y2-x2-x-6/x+2除以(x+y)
已知实数x,y满足3x2+2y2=6x,则x2+y2的最大值是
实数x、y满足3x2+2y2=6x,则x2+y2的最大值为
若x2+y2=4,则x-y最大值
x2+y2=4则4x+3y最大值
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
已知实数x,y满足x2+xy+y2=3,则x2-xy+y2的最小值
如题:若4x=5y(y≠0),则x2-y2/y2=?.
(x+√(x2+2011))(y+(√y2+2011))=2011,x2-3xy-4y2-6x-6y+58