题目: 若正实数a,b,c满足b(a+b+c)+ac≥16,a+2b+c≤8,则a+2b+c的值为( )A.8B.6C.4D.2 答案: ∵b(a+b+c)+ac≥16,a+2b+c≤8当a=b=c 时,a=b=c=2满足已知条件,此时a+2b+c=8故选A
题型:选择题 —Why are you so excited? —Peter invited me _______ on a trip to Yuntai Mountain. [ ]A. to goB. goC. going D. went 查看答案