标题: [求助]prep 数学模考题 [打印本页]
作者: taozike 时间: 2009-11-12 16:05 标题: [求助]prep 数学模考题
at a certain store, each notepad costs x dollars and each marker costs y dollars, if 10 is enough to buy 5 notepads and 3 markers, is 10 enough to buy 4 notepads and 4 markers instead?
(1) each notepad costs less than 1
(2) 10 is enough to buy 11 notepads.
答案是E.但是我不知道为什么？
这里的enough to 是不是不能认为等于？
也就是说不能推出10=5x+3y? 10=11x
作者: taozike 时间: 2009-11-14 12:27
没有人回答/
| 欢迎光临 国际顶尖MBA申请交流平台--TOPWAY MBA (http://forum.topway.org/) |
Powered by Discuz! 7.2 |