已知x2+y2+4x-2y+5=0,求x2+2xy+y2值
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)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x2+4y2+x2y2-6xy+1=0,求 x4-y4/2x-y 乘 2xy-y2/xy-y2 除以(x2+y2/x
已知X2-2x+y2+6y+10=0,求(x2-2xy)/(xy+y2)的值
已知:x=3,y=-5,x2-2xy+y2/x2-y2的值是
已知非零实数x,y满足:x2+xy-2y2=0,求(x2+3y+y2)/(x2+y2)的值
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
已知xy满足x2+y2-6x+2y+10=0,求立方根号x2-y2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=20,x2+xy-2y2=2(x+2y),求x+y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