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2.1.1 有理数的加法 必刷题习题

2.1.1 有理数的加法 必刷题习题

有理数的加法知识点整理

一、有理数加法核心法则

有理数加法分为三类计算规则,是本章计算根基,可通过口诀记忆:同号相加不变号,异号相加大减小,大数定符号,相反数相加得0,数加0仍得原数。

1. 同号两数相加

取相同符号,绝对值相加。如 (-3) + (-5) = -(3 + 5) = -8,两个负数相加,结果符号为负,数值直接相加。

2. 异号两数相加(绝对值不等)

取绝对值更大数字的符号,用大绝对值减小绝对值。如 (-12) + (+8) = -(12 - 8) = -4,负数绝对值更大,最终结果为负。互为相反数的两数相加和为0,例 (+3.6) + (-3.6) = 0

3. 一个数与0相加

结果仍为这个数,例 0 + (-2025) = -2025

解题通用三步法:一看符号,判断适用法则;二定结果正负;三计算绝对值和差。


二、有理数加法运算律

小学加法交换律、结合律在有理数范围完全适用,核心区别是交换数字时必须连带数字前符号一起移动

1. 加法交换律

a + b = b + a,交换加数位置,和不变。

2. 加法结合律

(a + b) + c = a + (b + c),可自由结合任意加数优先计算。

简便计算技巧:分组凑整,优先合并互为相反数、同号整数、同分母分数,简化运算。如 23.7 + (-9.3) + (-23.7) + 9.3 + (-8.8),先合并相反数 23.7 与 -23.7-9.3 与 9.3,快速算出结果 -8.8


三、有理数加法实际应用

用正负数表示相反意义的量,两类典型题型:

1. 位置判断

规定正方向后,把所有路程相加,和的符号代表方位,绝对值代表距离出发点的距离。

2. 油耗/总路程计算

路程无正负,需取每段路程绝对值相加得到总里程,再结合单位消耗计算总量。

3. 盈亏销售问题

先算出价格浮动总和,结合成本判断盈利亏损,再计算平均售价。


四、高频易错点

拆分带分数计算极易出现符号错误 例如计算 3¼ + (-2⅗) + 5¾ + (-8⅖),需整数、分数分组分别计算,分开处理正负,避免符号混淆。


五、整体解题思路总结

有理数加法解题分为两大模块:纯计算实际应用题

  • 纯计算:先判断符号套用法则,复杂算式用运算律分组简化。
  • 实际应用题:先设定正负代表含义,再列式求和,根据题意区分“和”与“绝对值和”的不同用途。

本章是初中代数计算基础,符号判断是丢分核心,每天坚持少量计算练习,能大幅减少马虎错误。


绝对值及有理数的大小比较(练习题)

基本 文件 流程 错误 SQL 调试
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  1. CONNECT:[ UseTime:0.000697s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000847s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000343s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000269s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000478s ]
  6. SELECT * FROM `set` [ RunTime:0.000182s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000570s ]
  8. SELECT * FROM `article` WHERE `id` = 856423 LIMIT 1 [ RunTime:0.000408s ]
  9. UPDATE `article` SET `lasttime` = 1783933293 WHERE `id` = 856423 [ RunTime:0.011924s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000385s ]
  11. SELECT * FROM `article` WHERE `id` < 856423 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000517s ]
  12. SELECT * FROM `article` WHERE `id` > 856423 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000404s ]
  13. SELECT * FROM `article` WHERE `id` < 856423 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000868s ]
  14. SELECT * FROM `article` WHERE `id` < 856423 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000774s ]
  15. SELECT * FROM `article` WHERE `id` < 856423 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000897s ]
0.095283s