若(x+1/x)^2=9,则(x-1/x)^2=_______;已知x^2+y^2=6,xy=5,则x+y=______
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
已知1/x=1/y=6,则3x-2xy+3y/3xy+x+y=?
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
已知实数x,y满足5x²+2y²+1=6xy+4x-2y,则x²-xy+2000y
已知x+y=1,xy=1/5,则x^2y=xy^2
1.若x=2,y=1,则(x-y)(x²+xy+y²)=______.
已知x/1-y/1=3,则5x+xy-5y/x+2y-y的值为
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
已知1/x减1/y=-3,则(2x+xy-2y)/x-xy-y的值为
已知x分之1+y分之1=-2,则x+xy+y分之x-xy+y的值等于
已知正实数x、y满足x+2y=xy,则2x+y的最小值等于______.