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专题01实数八大题型(举一反三)(原卷版)_02中考总复习(2026版更新中)_02-数学-中考总复习_2024年中考复习资料_一轮复习资料

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专题01实数八大题型(举一反三)(原卷版)_02中考总复习(2026版更新中)_02-数学-中考总复习_2024年中考复习资料_一轮复习资料
专题01实数八大题型(举一反三)(原卷版)_02中考总复习(2026版更新中)_02-数学-中考总复习_2024年中考复习资料_一轮复习资料
专题01实数八大题型(举一反三)(原卷版)_02中考总复习(2026版更新中)_02-数学-中考总复习_2024年中考复习资料_一轮复习资料
专题01实数八大题型(举一反三)(原卷版)_02中考总复习(2026版更新中)_02-数学-中考总复习_2024年中考复习资料_一轮复习资料
专题01实数八大题型(举一反三)(原卷版)_02中考总复习(2026版更新中)_02-数学-中考总复习_2024年中考复习资料_一轮复习资料
专题01实数八大题型(举一反三)(原卷版)_02中考总复习(2026版更新中)_02-数学-中考总复习_2024年中考复习资料_一轮复习资料
专题01实数八大题型(举一反三)(原卷版)_02中考总复习(2026版更新中)_02-数学-中考总复习_2024年中考复习资料_一轮复习资料
专题01实数八大题型(举一反三)(原卷版)_02中考总复习(2026版更新中)_02-数学-中考总复习_2024年中考复习资料_一轮复习资料
专题01实数八大题型(举一反三)(原卷版)_02中考总复习(2026版更新中)_02-数学-中考总复习_2024年中考复习资料_一轮复习资料

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关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 专题 01 实数【八大题型】 【题型1 无理数的识别】..........................................................................................................................................3 【题型2 实数与数轴】..............................................................................................................................................4 【题型3 无理数的估算】..........................................................................................................................................4 【题型4 用科学记数法表示数】..............................................................................................................................5 【题型5 实数的简单运算】......................................................................................................................................5 【题型6 数的简便运算】..........................................................................................................................................5 【题型7 实数的混合运算】......................................................................................................................................6 【题型8 实数与数轴的综合运算】..........................................................................................................................7 【知识点 实数】 1.实数的分类 分法一: 正有理数 有限小数或 有理数 0 无限循环小数 负有理数 实数 正无理数 无理数 无限不循环小数 负无理数 分法二: 实数 ¿{ 正实数 ¿{0 ¿¿¿ 2.实数的相关概念 (1)数轴 规定了原点、正方向和单位长度的直线叫做数轴。 (2)相反数 代数定义:只有符号不同的两个数叫做互为相反数。 几何定义:在数轴上原点的两旁,离开原点距离相等的两个点所表示的数,叫做互为相反数。 一般地,a和-a互为相反数。0的相反数是0。 a =-a所表示的意义是:一个数和它的相反数相等。很显然,a =0。 1关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 (3)绝对值 定义:一般地,数轴上表示数a的点与原点的距离叫做数a的绝对值,记作|a|。 一个正数的绝对值是它本身;一个负数的绝对值是它的相反数;0的绝对值是0。 即:如果a >0,那么|a|=a; 如果a =0,那么|a|=0; 如果a <0,那么|a|=-a。 a =|a|所表示的意义是:一个数和它的绝对值相等。很显然,a≥0。 (4)倒数 定义:乘积是1的两个数互为倒数。即:如果a与b互为倒数,则有ab=1,反之亦成立。 所表示的意义是:一个数和它的倒数相等。很显然,a =±1。 3.科学记数法 定义:把一个大于10的数表示成a×10n的形式(其中a大于或等于1且小于10,n是正整数),这种记数 方法叫做科学记数法。小于-10的数也可以类似表示。 用科学记数法表示一个绝对值大于 1 0 的数时, n 是原数的整数数位减 1 得到的正整数。 用科学记数法表示一个绝对值小于 1 的数( a×1 0 -n )时, n 是从小数点后开始到第一个不是 0 的数为止 的数的个数。 4.近似数和精确度 一般地,一个近似数四舍五入到哪一位,就说这个数近似到哪一位,也叫做精确到哪一位。精确到十 分位——精确到0.1;精确到百分位——精确到0.01;···。 5.实数的大小比较 (1)数轴比较:在数轴上表示的两个数,右边的数总比左边的数大。 (2)求差比较:设a、b是实数, , , a a a >1⇔a>b; =1⇔a=b; <1⇔a|b|⇔ab2 ⇔ab D.−a
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  1. CONNECT:[ UseTime:0.000923s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001829s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000871s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000590s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001385s ]
  6. SELECT * FROM `set` [ RunTime:0.000523s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001491s ]
  8. SELECT * FROM `wendang` WHERE `id` = 331529 LIMIT 1 [ RunTime:0.003107s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 331529 [ RunTime:0.010716s ]
  10. UPDATE `wendang` SET `lasttime` = 1772498602 WHERE `id` = 331529 [ RunTime:0.001343s ]
  11. SELECT * FROM `wendang` WHERE `id` < 331529 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001294s ]
  12. SELECT * FROM `wendang` WHERE `id` > 331529 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001057s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 331529 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004922s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 331529 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006171s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 331529 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005529s ]
0.134013s