题目

设变量，满足约束条件，则目标函数的最小值为__________ 答案：【答案】3【解析】画出可行域，判断出可行域为△ABC(如图)，其中A(1,1)，B(2,0)，C(3,3)，平移直线2x＋y＝0，易知，当平移到点A(1,1)时，目标函数z＝2x＋y取得最小值3.--- Who has made a mess in my room?--- Who else ______ have done it but your naughty son?A.wouldB.couldC.shouldD.must