若x不等于0是x2+xy-2y2=0,则x2+3xy+y2/x2+y2=
x2-y2=xy,xy不等于0求x2/y2=y2/x2
若x2+xy-2y2=0,则x
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
若x<y<0,则x2−2xy+y2+x2+2xy+y2=( )
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
已知:x=3,y=-5,x2-2xy+y2/x2-y2的值是
已知x2+4y2+x2y2-6xy+1=0,求 x4-y4/2x-y 乘 2xy-y2/xy-y2 除以(x2+y2/x
已知实数x,y满足x2+xy+y2=3,则x2-xy+y2的最小值
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?
已知非零实数x,y满足:x2+xy-2y2=0,求(x2+3y+y2)/(x2+y2)的值
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