已知2x2-xy-3y2=0,求x−yx+y
已知2x2-xy-3y2=0,求x−yx+y
已知3x2+xy-2y2=0,求(x+yx-y+4xyy
已知x2+y2-6x-8y+25=0,求代数式yx−xy
已知x2+y2-2x-4y+5=0,分式yx−xy
已知x2+3xy-4y2=0(y≠0),则x−yx+y
已知x2-4xy+4y2=0,那么分式x-yx+y
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
已知实数x,y满足方程x2+y2-4x+1=0,求yx
已知实数x、y满足2x2-7xy+3y2=0,求x:y
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2x2-3xy+y2=0(xy≠0),则xy+yx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