六年级数学第21周抓“不变量”解题奥数课件.pptx

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第21周 抓“不变量”解题,一些分数的分子与分母被施行了加减变化,解答时关键要分析哪些量变了,哪些量没有变。抓住分子或分母,或分子、分母的差,或分子、分母的和等等不变量进行分析后,再转化并解答。,一、知识要点,【例题1】 【思路导航】,二、精讲精练,同步教材免费视频,【练习1,第21周 抓不变量解题 疯狂操练二,【例题2】 【思路导航】,第21周 抓不变量解题 疯狂操练二,【练习2】,第21周 抓不变量解题 疯狂操练三,【例题3】【思路导航】 。,【练习3】,第21周 抓不变量解题 疯狂操练四,【例题4】 【思路导航】,【练习4】,第21周 抓不变量解题 疯狂操练五,【例题5】 【思路导航】,【练习5】,

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