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在通过对尖子生的培养，使他们在原来的水平上有一个大的提高，熟练掌握一点儿知识技能，使之在数学领域有创新有发展，将来为社会做出自己特殊的贡献。
每期三道有代表性的题目，奉献给六年级同学，期望对你参加“拔尖生”选拔有所帮助。
202.简便计算
×(1/3+1/5+1/7)
参考答案难题详解
202.解题思路
203.解题思路
利用除法与分数的关系，变式得：
204.解题思路
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