已知4x+5y=1,若x+y≥1,则x的最小值为______?

已知4x+6y=1 若x=y 则x,y的值等于?若x+y=0 则x=?y=? 已知4x+5y=1,若x+y≥1,则x的最小值为______? 已知x×x×y×y+x×x+y×y+1=4xy,求x,y的值快 已知x,y满足x-1≥0,x-y-1≤0,2x+y-5≤0,则z=y/(x+2)的最大值为 已知变量x,y满足约束条件x-y+1≤0 2x+y-5≤0 x ≥0 则z=x+y的最大值 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙 已知实数x,y满足方程x*x+y*y-4x+1=0.求y-x的最大值 已知x平方+y平方-2x+4y+5=0,则4/(y+x/1)咋做的 已知实数x,y满足,X-2y≥-4,3x-2y≤12,x+y≥2,则y/(x+1)的取值范围 已知实数x,y满足条件x≥0,y≥x,3x+4y≤12,则(x+2y+3)/(x +1)的最大值是 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(x+2009y)的值. 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(x+2009y)的值. 已知x+y=a,2x-y=-2a,求[（x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值 已知x属于R,y>0,集合A={x|x*x+x+1,-x,-x-1},集合B={-y,-y/2,y+1}若A=B,则x*x+y*y的值为 已知x,y满足丨x-5丨+(x-y-1)的平方=0,则x={ }y={ } 已知x/1-y/1=3,则5x+xy-5y/x+2y-y的值为 已知1/x-1/y=3,则5x+3y-5y/x-2xy-y的值