x+y=2,xy=8,(2x+y)×(x+y)=多少?

f(xy,x-y)=x^2+y^2+xy;f(x,y)/∂x;f(x,y)/∂y |x|/x+y/|y|+xy/|xy|= [-xy^2(2x+y)-8xy)-x^2y)]除以2xy=计算 已知x-xy=8,xy-y=-9,求x+y-2xy的值 x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________? 诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy) 已知xy/x+y=2,求代数式8x-5xy+8y/-x+3xy-y的值 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? (-x+2y)(2x+y)-(2x+y)(y-2x)-3xy=?因式分解 x+y=-3 xy+x+y=-2 x/y+y/x=? f(x+y,x-y)=(x^2-y^2)/2xy,求f(x,y)! 正数x,y满足x-y=2xy,求x-y/x+y的值. f(x+y,x-y)=2xy(x-y),求f(x,y) (x^3-2x^2+xy^2)/(x-y)+(x+y)(y-x)=? 已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值 x+y=2,xy=8,(2x+y)×(x+y)=多少? 2x+8y-xy=0(x>0,y>0),求x+y的最小值 已知正数x,y满足2x+8y-xy=0,x+y的最小值