x2-7xy+12y2=0(y不等于0)求x,y
已知x+2y=0(x不等于0)求分式2xy+y2/x2-xy
已知xy不等于0,且3x2-2xy-8y2=0,求x/y的值?
已知2x2+5xy-3y2=0且xy不等于0,求x:y的值
已知实数x、y满足2x2-7xy+3y2=0,求x:y
已知x2+y2=3xy且xy不等于0,求x的平方y的-2次方+x的-2次方y的平方的值
X2-4XY+3Y2=0(跟在字母后面的2是平方),且XY不等于零,求X/Y+Y/X的值
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy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
x2-y2=xy,xy不等于0求x2/y2=y2/x2
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
已知x>y>0,且xy=1,求 (x2+y2)/(x-y)的最小值,