题目内容
已知实数x、y足约束条件
,若使得目标函数ax+y取最大值时有唯一最优解(1,3),则实数a的取值范围是
2021-06-17
A.[-2,-1]
B.(-∞,-2]
C.(-∞,-1)
D.(-∞,-1)∪(1,+∞)
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