贡献一道数学和作文

zhfan

数学：

有四个罐子，每个罐子里有M个球，现在从一号罐子里取出一部分球，分别放到2号3号4号罐子里，使得最终每个罐子里球的数目为1：4：6：7（好像是这个数），请问1号罐子里还有多少个球，有M来表示。

作文：
应该是题库里116题

The following appeared in a memorandum to a team developing accounting software for SmartPro Software, Inc.:
“Currently, more professional accountants use SmartPro accounting software than any other brand.  However, in the market for personal accounting software for non-professionals to use in preparing their income tax returns, many of our competitors are outselling us.  In surveys, our professional customers repeatedly say that they have chosen SmartPro Software because our most sophisticated software products include more advanced special features than competing brands.  Therefore, the most effective way for us to increase sales of our personal accounting software for home users would clearly be to add the advanced special features that our professional software products currently offer.”

clairette

第一道是不是3m/4 个球

anadaba

7/9m?

bbkk709394

2/9吧，四个罐子每个M总共4M；1+4+6+7=18，就是将4M分成18分，每一份就是2M/9。第一个罐子为1就是2M/9

anadaba

对，拿出了7/9m

xieliuyan88

2/9 M

elephantybee

还剩下M/18个球