已知x,y满足约束条件{x>=0且3x+4y>=0且y>=0,则x平方+y平方+2x的最小值是x,y的可行域已画出来,但不知如何用到2次方程中,

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x+2y-3=0,y-1 已知实数x,y满足约束条件x+y>3,y 已知x,y满足约束条件x-y+5>=0 x+y>=0 X 已知x,y满足约束条件：x-y+1>=0,x+y-2>=0,x 已知X,Y满足约束条件x-y+5>=0 x+y>=0 X 已知x,y满足约束条件x>=1,x-3y 已知变量x满足约束条件1：x-y+2=1；3:x+y-7 设x,y满足约束条件{x>=0,y>=x,4x+3y 设x,y满足约束条件x>=0 y>=x 4x+3y 已知变量x,y满足约束条件1 已知x,y满足约束条件1 已知xy满足约束条件y=2 2X+y 已知x,y满足约束条件x+y==-1,y>=1 若0= 已知x、y满足约束条件X+Y》0且x-y+5≥0且X《3,则Z=丨4x-y丨的最大值是?最好有图! 设变量X,Y满足约束条件{X-Y+3>=0,X+Y>=0,-2 设变量x,y满足约束条件:x-y+3>=0 x+y>=0 -2 已知x,y满足约束条件 2x+5y>=10 2x-3y>=-6 2x+y