论文部分内容阅读
编者的话:为增进编辑部与读者的沟通与交流,《读写算》小学高年级版2012年推出“期期有奖”栏目:每期提供两道数学思考题,开展有奖征答活动。欢迎有兴趣的同学参与答题。你只需用很
Editor’s Note: In order to promote the communication and exchange between the editorial department and the readers, the “Yearbook for Primary School Reading and Writing” was launched in 2012 with the title of “Periodical Prizes”: two math questions for each issue and a prize solicitation activity. Interested students are welcome to participate in the answer. You only need to use it