【引子】复习进行时中,一日,好友电话求援:六个圆,排成四行,每行三个,如何排?思索着这题,感觉特别有味道,如何处理好这道题呢?想起教室里有一部分思维特别活跃却始终不能展翅的孩子,眼前一亮,计上心来。于是,将之公布于教室,悬赏求解。一日,无动静。吾摇头叹息,曰:可惜了哦,如此之题,寂寞也!偷偷一瞥,低垂的头颅中,有几颗不甘心的眸子眸光流转。再日,一只怯怯的小手微微地举起,略有疑虑,问:“老师,我这样解不知道是不是正确哦!”我赞许地看着她,示意她上台讲解。“六个圆形要能排成六行,每行三个,常规的排法肯定是行不通的,就必须 【Primer】 Review during the first day, a friend calls for help: six rounds, arranged in four lines, three per line, how to row? Think about this question, I feel particularly taste, how to deal with this problem? Reminiscent of the classroom, there are some particularly active thinking has always been able to spread the wings of children, eyes, mind. So, will be published in the classroom, reward for solution. One day, no movement. I shake my head and sigh, said: a pity Oh, so the question, lonely! Sneaky glances, drooping skull, there are several unwilling pupil Mouguang flow. On the other day, a timid little hand lifted slightly, with slight doubts, and asked: ”Teacher, I do not know if it is correct!“ I looked at her with a thumbs-up and showed her how she came to power. ”Six rounds to be able to line up six lines, three per line, the conventional method is certainly not feasible, we must