若2x+y=0,则x²+xy+y²/2xy-x²的值( )
若2x+y=0,则x²+xy+y²/2xy-x²的值( )
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
若x+2y=0,xy不等于0,求分式x²+2xy/xy+y²的值
若实数xy满足x≥y≥2,且2x²-xy-8x+2y+9=0,则根号xy的值
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
已知x²-7xy+12y²=0求x²-xy+y²/2xy的值
已知x²-x-2xy+y+y²,求代数式½(x²+y²)-xy的值
若x²+xy-2x+y=0,y²+xy+x-2y=0,求x+y的值
若|2x+y-1|+(x-2y)²=0,则x²+xy+y²的值为?
求3x²y-2xy²+2(xy-二分之三x²y)-xy+3xy²的值,其中x=3
已知2x²-5xy-3y²=0(xy≠0),则y分之x+x分之y的值是?
已知:x²+y²-4x-2y+5=0,求x+√xy分之(√x-√y)²+4√xy的值.