若x+y=5,x^2+y^2=13,则x^2y+2x^2y^2+xy^2=_________-
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*
若x+y=3,xy=2,则(5x+2)-(3xy-5y)=_________
已知2log3[(x—y) / 2]=log3(xy),则x / y=_________.
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
若正实数x.y满足x+y=xy,则x+2y的最小值
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
1.(1)(x^2y-xy^2)÷(x-y)=_________.
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-
若1/x+1/y=2,则(2x-xy+2y)÷(3x+5xy+3y)