我喜欢看课外书。今天,我从书房里拿出一本《小学数学方法大全》看得不亦乐乎,忽然一道难题挡在我的眼前,题目是这样的:一个数减去3,乘以5,再加上6得31,求这个数。想了一会儿,不知从哪里入手,便拿着书本请教妈妈去。妈妈一看,说道:“确实有点难度,不过,告诉你一个小窍门,怎样来的就怎样去。”我 I like to read extra-curricular books. Today, I come out from the study a “primary school mathematics method Encyclopedia” bothered, suddenly a problem stuck in my eyes, the title is this: a number minus 3, multiplied by 5, plus 6 get 31, find this number. For a moment, I do not know where to start, they took the book to ask her mother to go. Mom said, and said: “It is a bit difficult, but tell you a little trick, how to go.” "I