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ID:56748498
大小:1.56 MB
页数:23页
时间:2020-07-07
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1、ù¢计算板块.................................................................................................................................................2计数板块....................................................................................................................
2、.............................5数论板块.................................................................................................................................................7应用题板块.........................................................................................
3、..................................................11几何板块...............................................................................................................................................15行程板块.....................................................................
4、..........................................................................21abba,abcacbZ`±2、加法结合律:abcabc1、加法交换律:3、乘法交换律:abba,abcacb4、乘法结合律:abcabc5、乘法分配律:abcabac6、“除法分配律”:abcacbc7、减法性质:abcabc8、除法性质:abcabc9、商不
5、变性质:abambmanbn,m0,n010、积不变性质:abambm,m011、等差数列相关:项数n,公差d,首项a,第n项a,前n项和S,1nn通项公式:aan1d,aanmd,n1nm项数公式:naad1,n1若mnpq,aaaamnpq求和公式:Saan2,n1n中项定理,奇数项等差数列:Sannn12nn1从1开始连续自然数求和:12n22从1开始连续奇数求和:13
6、2n1n从2开始连续偶数求和:242nnn1n12、多位数乘法:M99M101当M99时,积的数字和为9nn个9n个922222213、aba2abb,aba2abb 22ababab,a1b1abab133223aba3ab3abb33223322ababaabb,ababaabb222114、平方求和:12nnn12n163332122立方求和:12
7、n12nnn14115、整数裂项:1223nn1nn1n231123234nn1n2nn1n2n34113352n12n12n32n12n1361111分数裂项:11223nn1n1111111123234nn1n2212n1n216、缺8数:123456799111111111,1234567918
8、222222222,···,1234567981999999999;123456798987654321··2··3··17、走马灯数:0.142857
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