标题: 求解og12一道数学题 152 [打印本页] 作者: christinashao 时间: 2010-7-19 23:53 标题: 求解og12一道数学题 152 请问各位nn们一道og12数据充分性题 152 carmen tapes 那道题 解题思路是什么啊？？ 感激不尽~~~作者: xiaomimi 时间: 2010-7-20 09:16
Let x stands for the number of tapes Carmen has and y stands for that of R x+12=2y is given x=2y-12, now compare x with y, it is also 2y-12 with y 2y-12 <>= y 12 is a seperating point but 5 is not.