x2-2xy-3y2=0,其中x,y均不为零,求(y-x)/x2-xy/2x-y-y2/xy-x
已知x2-2xy=3y2且x,y为非零实数 求:(1)2x+y/x-2y (2)2x2-3y2+5xy/x2+xy+y2
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
已知非零实数x,y满足:x2+xy-2y2=0,求(x2+3y+y2)/(x2+y2)的值
已知X2-2x+y2+6y+10=0,求(x2-2xy)/(xy+y2)的值
x(x-1)-(x2-y)=-3,求x2+y2-2xy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
已知实数x、y满足2x2-7xy+3y2=0,求x:y
正数xy满足x2-y2=2xy,求x+y分之x-y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.
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
正整数x,y满足x2-y2=2xy,求x-y/x+y的值