我们爱生活,生活免不了去购物,购物都希望省钱,省钱需要学问,碰到有折扣希望得到最大的折扣率.读完《中小学数学》2015年第九期登载的《换购中自有乾坤,喝水中也有学问》一文,感受到生活问题中蕴含的方程和数列知识,有数学推理和智慧,又有生活的巧借智慧,有应用数学的乐趣和收获.对于巧借的应用,我意犹未尽!再举一例,以作补充. We love life and life inevitably go shopping, shopping wants to save money, save money need to learn, encounter discounts and hope to get the maximum discount rate. After reading “Primary School Math” in the ninth issue of 2015, “the purchase of its own ”Heaven and oh, there is also learning in drinking water", I feel the equations and series of knowledge contained in life problems, there are mathematical reasoning and wisdom, but also have the clever wisdom of life, there is the fun and harvest of applied mathematics. For the use of clever, I’m still full of ideas! Give another example to add it.