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若实数满足不等式组,目标函数的最大值为2,则实数a的值是 ( ) A.-2 B...

 若实数6ec8aac122bd4f6e满足不等式组6ec8aac122bd4f6e,目标函数6ec8aac122bd4f6e的最大值为2,则实数a的值是                                                               (    )

A.-2                    B.0                  C.1                  D.2

 

D 【解析】实数x,y满足不等式组,显然当x=2,时,目标函数t=x-2y取得最大值,即,所以a=2.
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