2022年奥数专题分数加减法中的巧算- .pdf
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1、奥数专题分数加减法中的巧算（2）同学们！在上一讲中，我们一起研究了一些分数加减法中的巧算方法，在这一讲中，我们继续来研究相关知识。（一）阅读思考：1.什么是拆分？拆分就是把一个分数写成几个分数的和或差的形式。例如：16115110161213学会了拆分，有时就可以不通分，也能较简便地解决上面的问题。2.观察思考16123121311213413141201451415130156151614216716172155335131542173371317当一个分数，分母是两个数的乘积，分子是这两个数的差时，就可以拆成这两个数分别作分母，1 作分子的分数的差。也就是dnndnndnd()1100（，
2、）例 1.计算：113135157119931995119951997因为前面讲过，dnndnnd()11当nd12，时，有2131113当nd32，时，有2351315当nd52，时，有2571517当nd19932，时，有2199319951199311995当nd19952，时，有2199519971199511997所以：11313515711993199511995199711131315119931199511995119971111997199619976.求下面所有分数的和：11122212132333231314243444342414；，；，；，；1199121991198
3、919911990199119911991199019911989199111991，。解答：111122212213233323133142434443424144所以：111222121323332313119912199119901991199119911990199111991123+1990+1991（1+1991）1991199219913966072【模拟试题】（答题时间：30 分钟）（二）尝试练习文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4
4、K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7
5、G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C
6、7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8
7、I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7
8、K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X
9、3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:C
10、T8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K61.计算：2132352572792199719992199920012.计算：11113113151151711719119213.计算：119881989119891990119901991119911992119921993119934.计算：3432837031305.计算：42130120112161216.求出 3 至 9 之间所有分母为2 的最简分数之和。文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G
11、2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4K9S10T6 HB7K7G3A8X6 ZN1X3C7G2K6文档编码:CT8I4
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