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1、vip 会员免费分数裂项校区班级姓名本讲知识点属于计算大板块内容,其实分数裂项很大程度上是发现规律、利用公式的过程,可以分为观察、改造、运用公式等过程。很多时候裂项的方式不易找到,需要进行适当的变形,或者先进行一部分运算,使其变得更加简单明了。本讲是整个奥数知识体系中的一个精华部分,列项与通项归纳是密不可分的,所以先找通项是裂项的前提,是能力的体现,对学生要求较高。一、“裂差”型运算将算式中的项进行拆分,使拆分后的项可前后抵消,这种拆项计算称为裂项法.裂项分为分数裂项和整数裂项,常见的裂项方法是将数字分拆成两个或多个数字单位的和或差。遇到裂项的计算题时,要仔细的观察每项的分子和分母,找出每项分
2、子分母之间具有的相同的关系,找出共有部分,裂项的题目无需复杂的计算,一般都是中间部分消去的过程,这样的话,找到相邻两项的相似部分,让它们消去才是最根本的。(1)对于分母可以写作两个因数乘积的分数,即1ab形式的,这里我们把较小的数写在前面,即ab,那么有1111()abba ab(2)对于分母上为3 个或 4 个连续自然数乘积形式的分数,即:1(1)(2)nnn,1(1)(2)(3)nnnn形式的,我们有:1111(1)(2)2(1)(1)(2)nnnnnnn1111(1)(2)(3)3(1)(2)(1)(2)(3)nnnnnnnnnn裂差型裂项的三大关键特征:(1)分子全部相同,最简单形式为
3、都是1 的,复杂形式可为都是x(x 为任意自然数)的,但是只要将x 提取出来即可转化为分子都是1 的运算。(2)分母上均为几个自然数的乘积形式,并且满足相邻2 个分母上的因数“首尾相接”(3)分母上几个因数间的差是一个定值。学习目标知识点拨vip 会员免费二、“裂和”型运算:常见的裂和型运算主要有以下两种形式:(1)11abababababba(2)2222ababababababba裂和型运算与裂差型运算的对比:裂差型运算的核心环节是“两两抵消达到简化的目的”,裂和型运算的题目不仅有“两两抵消”型的,同时还有转化为“分数凑整”型的,以达到简化目的。【例 1】111111 223344556。
4、【巩固】111.101111 125960【巩固】2222109985443【例 2】111111212312100【例 3】11111 3355799101【巩固】计算:1111251335572325【巩固】计算:324567125577 1111 161622222929【巩固】11111113610152128习题练习文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M
5、3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8
6、H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R
7、10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X
8、7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2
9、E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A
10、1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A
11、5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10vip 会员免费【巩固】计算:1111111112612203042567290【巩固】11111104088154238。【例 4】计算:1111135357579200120032005【例 5】74.50.1611111813153563133.753.23【例 6】计算:11111123420261220420【巩固】计算:11111200820092010201120121854108180270=。【巩固】计算:1122426153577_。【巩固】计算:1111111315356399143195【例 7】11112
12、3234789文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:C
13、U2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU
14、9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7
15、X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码
16、:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9
17、HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 Z
18、C7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10vip 会员免费【巩固】计算:11111 35246357202224【巩固】4444.135357939597959799【例 8】11111123423453456678978910【例 9】234501(12)(12)(123)(123)(12
19、34)(12349)(1250)【例 10】22222211111131517191111131.【巩固】计算:222222223571512233478【例 11】56677889910566778899 10【巩固】123791117253571220283042文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档
20、编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J
21、9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5
22、 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10
23、文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M
24、3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8
25、H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R
26、10vip 会员免费【巩固】1111120102638272330314151119120123124【巩固】计算:57911131517191612203042567290文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2
27、A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A
28、9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6
29、I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:C
30、U2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU
31、9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10文档编码:CU2A5X7M3J9 HU9A9M2E8H5 ZC7X6I4A1R10