解法:第n 年存的钱=800+x, 都可以求得x
276. 贴道傻瓜题吧, 偶的第一道题,很给信心 2^2+1/ 17/4277. 一矩形长16 宽8, 求与其面积相等的正方形的边长 ; 答案: 8根号2
278. 天山和本月jj都出现过
The toll for crossing a certain bridge is $0.75 each crossing. Drivers who frequently use the bridge may instead purchase a sticker each month for $13.00 and then pay only $0.30 each crossing during that month. If a particular driver will cross the bridge twice on each of x days next month and will not cross the bridge on any other day, what is the least value of x for which this driver can save money by using the sticker?
A. 14 B. 15 C. 16 D. 28 E. 29 SA:B
0.75x=13+0.3x x=28.9
就是说要至少29次this driver can save money by using the sticker ,每天2次,so至少15天
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