x2+2y2-2xy-2y+1=0
x2+2y2-2xy-2y+1=0
已知x2+4y2+x2y2-6xy+1=0,求 x4-y4/2x-y 乘 2xy-y2/xy-y2 除以(x2+y2/x
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
若x<y<0,则x2−2xy+y2+x2+2xy+y2=( )
已知X2-2x+y2+6y+10=0,求(x2-2xy)/(xy+y2)的值
若x2-2xy-y2-x+Y-1=0 求x-y的值
(x+y)(x+y+1)=0 求x2+y2+2xy的值
已知x-y+1,X2+Y2=25 求(x+y)2和x2-xy+y2的值
已知x2-3xy-4y2的绝对值+2倍根号x2+4xy+4y2-1=0 求3x+6y的值
已知x2+y2-10x-6y+34=0,求(x-y/x+y)2÷x2-y2/xy×x2+2xy+y2/x2-xy 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