文档介绍：一、单选题(共26小题)
,y满足约束条件则z=3x+y的最大值为(   )
                                 D.-1           
(   )
           B.-2                      D.-1           
, y满足约束条件则目标函数z=3x-y的取值范围是(   )
A.            B.           C.[-1,6]            D.           
, y满足则2x+3y的最大值为(   )
                                             
,则的最大值为(   )
A.                B.           C.           D.           
,y满足的最大值为(   )
                        C.           D.           
,则目标函数的最大值是(   )
                                            
, y满足约束条件则z=2x+y的最大值和最小值分别为(   )
                                            
), 当时取得极大值, 当时取极小值, 则的取值范围是(   )
A.             B.           C.           D.           
,y满足约束条件,则目标函数的最小值为(   )
A.-5            B.-4           C.-2                      
, y满足约束条件则z=2x-3y的最小值是(   )
A.-7           B.-6           C.-5           D.-3           
,满足约束条件,若目标函数的最小值为2,则的最大值为(   )
           B.           C.           D.           
,y满足的约束条件,则的最大值为(   )
                                            
,满足约束条件则目标函数的最小值为(   )
                                            
-4,则的值为(   )
A.           B.           C.           D.           
,满足约束条件且的最小值为7,则(   )
A.-5                      C.-5或3           -3           
,若取得最大值的最优解不唯一,则实数的值为(   )
A.           B.                      D.           
,则M-m=(   )
                                            
(   )
                                            
,y满足(   )
,最大值3           ,无最大值
,无最小值           ,也无最大值
、y满足约束条件,目标函数z=ax+2y仅在点(1,0)处取得最小值,则a的取值范围是(   )
A.(-1,2)           B.(-4,2)           C.(-4,0]           D.(-2,4)           
,若不等式组为常数)所