2.去年JJ 說過橋費本來是0.75,然後可以買一個STICKER 花13, 用這個每次過橋就可以只交0.30,一個人go across the bridge twice on each X days every month, 問如果買了sticker能夠省錢的話,the least value of X是多少
答案是14.15.16.17.18
作者答案: 我選了14
橙子評價:15,0.75*2*X>13+2*0.3*0.3, X>14.4444, x取整數,所以是15
3. D.S....一家公司的利潤來自於3個部門...問能否知道該公司超過5 billion
(1) the greatest department is more than 2.1
(2) the leastest department is more less 1.7
我選b
sorry....老媽叫我吃飯...晚點補
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