已知x2+2xy-2x+y2-2y+1=0,则x+y等于
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已知x+y=2,则12x2+xy+12y2等于( )
已知实数x,y满足(x2)+(y2)-xy+2x-y+1=0,求x,y的值
已知实数x、y满足X2+y2-xy+2x-y+1=0,试求x、y的值
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
已知x-y+1,X2+Y2=25 求(x+y)2和x2-xy+y2的值
已知x2+y2-2x-4y+5=0,则1xy+1(x+1)(y+1)+1(x+2)(y+2)+…+1(x+2010)(y
已知实数x、y满足2x2-7xy+3y2=0,求x:y
已知x(x-1)-(x2-y)=-3,求x2+y2-2xy的值
已知X2+Y2+8X+6Y+25=0 求代数式X2++XY+4Y2分之X2-4Y2 减X+2Y分之X的值
已知2x-3*根号(xy)-2y=0(x>0),则x2+4xy-16y2除以2x2+xy-9y2的值是多少?
已知X2-2x+y2+6y+10=0,求(x2-2xy)/(xy+y2)的值