若|x-7|+|y+6|=0,求xy的值.
若x+y=6,xy=2.75,x-y>0,求x-y的值
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
若x-y=5,-xy=3,求(7x+4y+xy)-6(5/6y+x-xy)的值
若x-y=5,-xy=3,求(7x+4y+xy)-6(5/6·y+x-xy)的值
若x=y=6,xy=2,求2x+3y-3xy+(4xy-3x)-(4y-7)的值
若X-Y=5,-XY=3,求(7X+4Y+XY)-6(六分之五Y+X-XY)的值
若x-y=5,-xy=3,求(7x+4y+xy)-6(六分之五y+x-xy)的值.
若x+y=5,xy=6,求x^2y+xy^2的值
若(3xy+2)+|7-x-y|=0,求代数式(5xy+10y)-[-5x-(4xy-2y+3x)]的值.
若x,y满足x^+2y^-2xy+1=0,求xy的值
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
若x+2y=0,xy不等于0,求分式x²+2xy/xy+y²的值