《中小学数学》(小学版)2007年第12期刊登了辛利书老师的《对一道易错题的解法探讨》(下称“辛文”),对五年级的一道易错题的解法,进行了分析探讨。原题如下:“妈妈要靠着一面墙壁用长78米的篱笆围出一块菜地来,怎么样围菜地的面积最大呢?” “Primary and secondary mathematics” (Primary Edition) In 2007 the twelfth published a book Sli book teacher “on a solution to the problem of easy solution” (hereinafter referred to as “Xin Wen”), a fifth-grade error-prone Solution method, carried out analysis and discussion. The original question is as follows: "Mom rely on a wall with a long 78 meters fence around a piece of vegetable, how about the largest area?