已知变量xy满足约束条件x-y+2≦0,x≧1,x+y-7≦0,则y/x的取值范围是
已知变量xy满足约束条件x-y+2≦0,x≧1,x+y-7≦0,则y/x的取值范围是
已知变量xy满足约束条件x≥-1,y≥x,3x+2y≤5,则2x+y的取值范围是
线性规划:已知变量xy满足约束条件X≥0 Y≥X 3X+4Y-12≤0,则S=X+2Y+3/X+1的取值范围?
已知变量满足约束条件x+2y>=2,2x+y=-1,则目标函数z=3x-y的取值范围是
设x、y满足约束条件{x≥0 y≥x 4x+3y≤12}则2y+3/x+1的取值范围是?
已知变量x,y满足约束条件为{x-y+2≤0,x+y-5≤0,x≥0}则(y-2)/(x+2)取值范围是_____
设变量x,y满足约束条件{x-y≥0,x+y≤1 x+2y≥1 求z=y/x+1的取值范围 z=(x-1/2)^2+y^
已知变量xy满足约束条件x+2y-3
已知变量x,y满足约束条件x+2y-3=0,y-1
已知变量x,y满足约束条件1
已知变量xy满足约束条件x-y≥1 x+y≥1 2x-y≤4 则z=y/x的最大值为
已知变量x、y满足x-y-2≤0,x+2y-5≥0,y-2≤0,则m=(2x-y-1)/(x+2y+1)的取值范围是?