已知2x2-3xy+y2=0(xy≠0),则xy+yx的值是( )
已知2x2-3xy+y2=0(xy≠0),则xy+yx的值是( )
已知5x2-xy-6y2=0,则yx
已知x2+xy=3,xy+y2=-2,则2x2-xy-3y2的值为( )
已知x2+3xy-4y2=0(y≠0),则x−yx+y
已知xy=27,则x2−3xy+2y22x2−3xy+7y2的值是( )
已知3x2+xy-2y2=0,求(x+yx-y+4xyy
已知2x2-xy-3y2=0,求x−yx+y
已知2x2+xy-3y2=0(y≠0),求xy
已知X2-2x+y2+6y+10=0,求(x2-2xy)/(xy+y2)的值
已知x2-xy=7,2xy+y2=4,则代数式x2+xy+y2的值是___.
已知2x-3*根号(xy)-2y=0(x>0),则x2+4xy-16y2除以2x2+xy-9y2的值是多少?
已知x2+y2-2x-4y+5=0,分式yx−xy