1.已知x,y满足|-2x+1|+(4x-3y-11)的二次方=0,求方程2x-ky=4中的k的值

已知X和Y满足3X+4Y=2,X-Y-1/7 已知x,y满足y^4+2x^4+1=4x^2y,求x,y的值 已知x,y满足约束条件：x-y+1>=0,x+y-2>=0,x 已知x,y满足{x>=1,x+y 已知x,y满足{x>=1,x+y 已知实数x,y满足x-ay-1>=0,2x+y>=0,x 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 已知实数x,y满足根号(x-1)+y^2=4y-4,求(x-y)^2012的值 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,y满足y 已知实数x,y满足方程x^2+y^2-4x-2y+1=0.求x^2+y^2+x+y的最大值和最小值. 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x和y满足3x+4y=2,x-y 已知x,y 满足约束条件y>=2|x|,x+y-1 已知实数x,y满足y=|x-1|,则x+2y的最大值是 已知实数x,y满足y=|x-1|若x+2y 已知关于X,Y的方程组{x+2y=4k的解满足-1 已知实数x,y满足x-y