已知x2+5xy-6y2=0且y≠0,求值:
已知x2+5xy-6y2=0且y≠0,求值:
已知2x2+5xy-3y2=0且xy不等于0,求x:y的值
已知x>y>0,且xy=1,求 (x2+y2)/(x-y)的最小值,
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X2-2x+y2+6y+10=0,求(x2-2xy)/(xy+y2)的值
已知x>y>0且xy=1.求x2+y2/x-y的最小值及此时xy的值
已知x2-5xy+6y2=0,则y:x等于( )
已知5x2-xy-6y2=0,则yx
已知2x2+xy-3y2=0(y≠0),求xy
已知x2-y2=xy,且xy≠0,求代数式x2y-2+x-2y2的值.
已知x、y是实数且满足x2+xy+y2-2=0,设M=x2-xy+y2,则M的取值范围是______.
已知xy不等于0,且3x2-2xy-8y2=0,求x/y的值?