2022年数学小学四年级数学知识点归纳 .pdf

1/16 小学四年级数学知识点归纳四年级上册知识点概括总结1.大数的认识：（1）亿以内的数的认识：十万：10 个一万；一百万：10 个十万；一千万：10 个一百万；一亿：10 个一千万；2.数级：数级是为便于人们记读阿拉伯数的一种识读方法，在位值制（数位顺序）的基础上，以三位或四位分级的原则，把数读，写出来。通常在阿拉伯数的书写上，以小数点或者空格作为各个数级的标识，从右向左把数分开。3.数级分类（1）四位分级法即以四位数为一个数级的分级方法。我国读数的习惯，就是按这种方法读的。如：万（数字后面 4 个 0）、亿（数字后面 8 个 0）、兆（数字后面 12 个 0，这是中法计数）。这些级分别叫做个级，万级，亿级。（2）三位分级法2/16 即以三位数为一个数级的分级方法。这西方的分级方法，这种分级方法也是国际通行的分级方法。如：千，数字后面3 个 0、百万，数字后面 6 个 0、十亿，数字后面9 个 0。4.数位：数位是指写数时，把数字并列排成横列，一个数字占有一个位置，这些位置，都叫做数位。从右端算起，第一位是“个位”，第二位是“十位”，第三位是“百位”，第四位是“千位”，第五位是“万位”，等等。这就说明计数单位和数位的概念是不同的。5.数的产生：阿拉伯数字的由来：古代印度人创造了阿拉伯数字后，大约到了公元 7 世纪的时候，这些数字传到了阿拉伯地区。到13 世纪时，意大利数学家斐波那契写出了算盘书，在这本书里，他对阿拉伯数字做了详细的介绍。后来，这些数字又从阿拉伯地区传到了欧洲，欧洲人只知道这些数字是从阿拉伯地区传入的，所以便把这些数字叫做阿拉伯数字。以后，这些数字又从欧洲传到世界各国。阿拉伯数字传入我国，大约是13 到 14 世纪。由于我国古代有一种数字叫“筹码”，写起来比较方便，所以阿拉伯数字当时在我国没有得到及时的推广运用。本世纪初，随着我国对外国数学成就的吸收和引进，阿拉伯数字在我国才开始慢慢使用，阿拉伯数字在我国推广使用才有 100 多年的历史。阿拉伯数字现在已成为人们学习、生活和交往中最常用的数字了。6.自然数：用以计量事物的件数或表示事物次序的数。即用数码 0，1，2，3，4，所表示的数。表示物体个数的数叫自然数，自然数由 0 开始(包括 0)，一个接一个，组成一个无穷的集体。文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 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ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L23/16 7.计算工具：算盘、计算器、计算机。8.射线：在几何学中，直线上的一点和它一旁的部分所组成的图形称为射线。如下图所示：8.射线特点（1）射线只有一个端点，它从一个端点向另一边无限延长。（2）射线不可测量。文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L24/16 9.直线：直线是点在空间内沿相同或相反方向运动的轨迹。10.线段：线段用表示它两个端点的字母或一个小写字母表示，有时这些字母也表示线段长度，记作线段或线段，线段a。其中表示直线上的任意两点。11.线段特点（1）有限长度,可以测量（2）两个端点12.线段性质：（1）两点之间线段最短。（2）连接两点间线段的长度叫做这两点间的距离。（3）直线上两个点和它们之间的部分叫做线段,这两个点叫做线段的端点。直线没有距离。射线也没有距离。因为，直线没有端点，射线只有一个端点，可以无限延长。13.角（1）角的静态定义具有公共端点的两条不重合的射线组成的图形叫做角。这个公共端点叫做角的顶点，这两条射线叫做角的两条边。（2）角的动态定义一条射线绕着它的端点从一个位置旋转到另一个位置所形成的图形叫做角。所旋转射线的端点叫做角的顶点，开始位置的射线叫做角的始边，终止位置的射线叫做角的终边文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L25/16 14.角的符号：角的符号：15.角的种类：角的大小与边的长短没有关系；角的大小决定于角的两条边张开的程度，张开的越大，角就越大，相反，张开的越小，角则越小。在动态定义中，取决于旋转的方向与角度。角可以分为锐角、直角、钝角、平角、周角、负角、正角、优角、劣角、0 角这 10 种。以度、分、秒为单位的角的度量制称为角度制。此外，还有密位制、弧度制等。（1）锐角：大于 0，小于 90的角叫做锐角。（2）直角：等于 90的角叫做直角。（3）钝角：大于 90而小于 180 的角叫做钝角。16.乘法：乘法是指一个数或量，增加了多少倍。例如4 乘 5，就是4 增加了 5 倍率，也可以说成5 个 4 连加。17.乘法算式中各数的名称：“”是乘号，乘号前面和后面的数叫做因数，“=”是等于号，等于号后面的数叫做积。10（因数）（乘号）200（因数）=（等于号）2000（积）18.平行：在平面上两条直线、空间的两个平面或空间的一条直线与一平面之间没有任何公共点时，称它们平行。如图直线平行于直线，记作。平行线永不相交。19.垂直：两条直线、两个平面相交，或一条直线与一个平面相交，如果交角成直角，叫做互相垂直。20.平行四边形：在同一平面内有两组对边分别平行的四边形叫做平行四边形。文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L26/16 21.梯形：梯形是指一组对边平行而另一组对边不平行的四边形。平行的两边叫做梯形的底边，其中长边叫下底，短边叫上底；也可以单纯的认为上面的一条叫上底，下面一条叫下底。不平行的两边叫腰；夹在两底之间的垂线段叫梯形的高。22.除法：除法法则：除数是几位，先看被除数的前几位，前几位不够除，多看一位，除到哪位，商就写在哪位上面，不够商一，0 占位。余数要比除数小，如果商是小数，商的小数点要和被除数的小数点对齐；如果除数是小数，要化成除数是整数的除法再计算。扩展资料1.“数位”与“位数”、“计数单位”均为意义不同的概念。“数位”是指一个数的每个数字所占的位置。数位顺序表从右端算起，第一位是“个位”，第二位是“十位”，第三位是“百位”，第四位是“千位”，第五位是“万位”，等等。同一个数字，由于所在的数位不同，它所表示的数值也就不同。例如，在用阿拉伯数字表示数时，同一个6，放在十位上表示 6 个十，放在百位上表示6个百，放在亿位上表示6 个亿等等。“位数”是指一个自然数中含有数位的个数。像458 这个数有三个数字组成，每个数字占了一个数位，我们就把它叫做三位数。198023456由 9 个数字组成，那它就是一个九位数。“数位”与“位数”不能混淆。文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L27/16 计数单位：一（个）、十、百、千、万、十万、百万、千万、亿、十亿、百亿、千亿，都是计数单位。“个位”上的计数单位是“一（个），“十位”上的计数单位是“十”，“百位”上的计数单位是“百”，“千位”上的计数单位是“千”，“万位”上的计数单位是“万”等等。所以在读数时先读数字再读计数单位。2.自然数知识扩展自然数集有加法和乘法运算，两个自然数相加或相乘的结果仍为自然数，也可以作减法或除法，但相减和相除的结果未必都是自然数，所以减法和除法运算在自然数集中并不是总能成立的。自然数是人们认识的所有数中最基本的一类，为了使数的系统有严密的逻辑基础，19 世纪的数学家建立了自然数的两种等价的理论:自然数的序数理论和基数理论，使自然数的概念、运算和有关性质得到严格的论述。一定是整数。用以计量事物的件数或表示事物次序的数。即用数码0，1，2，3，4，所表示的数。表示物体个数的数叫自然数，自然数由 0 开始(包括 0)，一个接一个，组成一个无穷的集体。3.角的其他分类平角：等于 180 的角叫做平角。优角：大于 180 小于 360 叫优角。劣角：大于 0小于 180 叫做劣角，锐角、直角、钝角都是劣角。周角：等于 360 的角叫做周角。负角：按照顺时针方向旋转而成的角叫做负角。文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码: