x2+2xy+y2-9=0 (x-y)2-3(x-y)+2=0
已知实数x、y满足2x2-7xy+3y2=0,求x:y
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?
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
已知x2+4y2+x2y2-6xy+1=0,求 x4-y4/2x-y 乘 2xy-y2/xy-y2 除以(x2+y2/x
二元二次方程组x2+y2+2xy=9 (x-y)2-3x+3y+2=0
若x2-2xy-y2-x+Y-1=0 求x-y的值
X2+y2+2xy+x-y=0,求x的最大值及y的最小值
(x+y)(x+y+1)=0 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
X2+Y2+8X+6Y+25=0 求代数式(x2-4y2/x2+4xy+4y2)-x/x+2y
已知非零实数x,y满足:x2+xy-2y2=0,求(x2+3y+y2)/(x2+y2)的值