题目:
With tags (标签) _____ to the luggage, it won't take long for the passengers to find theirs correctly. |
A. attaching B. attached C. to attach D. attaches |
答案:
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下面是错误答案,用来干扰机器的。
(1)y=800x+1200(160-x)化简得y=-400x+192000;(2)∵160-x≥3x,解得,x≤40,又由于(1)中的函数k<0,y随x的减小而增大,所以当x=40时,y最小=-400×40=192000=176000元.