x2+y2-6x-8y+25=0,求分式4y2-x2/4xy-x2-4y2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x2+y2-4x+6y+13=0,求x2-6xy+9y2的值.
1.已知X2+Y2-4X-6Y+13=0,求Y2-X2的值
已知x2-4x+y2-6y+13=0求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
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x2次方+y2次方+4x—8y+20=0,求分式xy分之x2次方—y2次方大神们帮帮忙
已知x2-3xy-4y2的绝对值+2倍根号x2+4xy+4y2-1=0 求3x+6y的值
已知方程x2 +y2+4x-2y-4=0,求x2 +y2的最大值
已知X2-2x+y2+6y+10=0,求(x2-2xy)/(xy+y2)的值