x-yx-2y÷x2-y2x2-4xy+4y2=x-yx-2y•(x-2
已知x2+y2-2x-4y+5=0,分式yx−xy
已知3x2+xy-2y2=0,求(x+yx-y+4xyy
已知2x2-xy-3y2=0,求x−yx+y
已知x-y=4xy,则2x+3xy-2yx-2xy-y
已知x2-4xy+4y2=0,那么分式x-yx+y
已知x2+3xy-4y2=0(y≠0),则x−yx+y
已知xy满足x^2+y^2+4/5=2x+y 求代数式yx/x+y的值
已知实数x,y满足方程x2+y2-4x+1=0,求yx
已知x2+y2-6x-8y+25=0,求代数式yx−xy
-x^2y+5xy^2-yx^2合并同类项
若x+y=4,xy=3,求yx
xy+yx=10x,y是多少