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第二章 有理数的运算 习题2.1

第二章 有理数的运算 习题2.1

有理数加减全章节知识点整理(习题2.1对应)

一、有理数加法

1. 加法法则(四种情况)

类型
法则
符号处理
绝对值处理
示例
同号两数相加
取相同符号,绝对值相加
取共同的符号
绝对值相加
异号两数相加
取绝对值较大数的符号,用大绝对值减小绝对值
取绝对值较大的符号
大绝对值 − 小绝对值
互为相反数相加
和为 
一个数加 
仍得这个数
不变
不变

加法法则口诀:

同号相加一边倒,异号相加"大"减"小"; 符号跟着"大"的走,相反数相加得  了。

2. 加法运算律(简便计算核心)

运算律
字母表示
作用
交换律
交换加数位置,便于结合
结合律
改变运算顺序,凑整简化

3. 常用凑整技巧

技巧
操作说明
示例
凑相反数
互为相反数的两数先结合,和为 
凑整数
小数、分数合并成整数
同分母分数先合并
分母相同的分数优先相加
同号分组
正数与正数、负数与负数分别结合

综合简便运算示例:

二、有理数减法

1. 减法核心法则

减去一个数,等于加上这个数的相反数。

2. 口诀:两变一不变

变化项
具体操作
一变
减号(−)→ 加号(+)
二变
减数 → 变成它的相反数
不变被减数
保持原样,不改变符号与数字

示例:

3. 减法的重要性质

  • 减法没有交换律
  • 减法没有结合律
  • 转化为加法后,可使用加法的交换律和结合律

三、有理数加减混合运算

1. 统一成加法(核心步骤)

步骤: 所有减法转化为加法 → 省略括号与加号 → 写成代数和形式

转化示例:

2. 运算顺序

  1. 先将所有减法统一为加法;
  2. 省略括号和加号,写成代数和;
  3. 运用加法交换律、结合律进行简便运算;
  4. 按从左到右的顺序得出结果。

3. 含绝对值的加减运算(三步走)

步骤
操作
第一步
判断绝对值内部算式的正负
第二步
去绝对值:正数、 的绝对值是本身;负数的绝对值是它的相反数
第三步
化简后做有理数加减混合运算

示例:

4. 分数加减运算技巧

类型
处理方法
同分母分数
分母不变,分子直接加减
异分母分数
先通分,再按同分母分数加减
带分数
整数部分与分数部分分别计算,再合并
小数与分数混合
统一化为小数或统一化为分数再计算

带分数运算示例:

四、有理数加减实际应用题型

1. 高度/温差问题

核心公式:

⚠️ 低于海平面、零下温度记为负数。

经典例题:

珠穆朗玛峰海拔  米,死海海拔  米,求高度差。

2. 变化量问题(气温、行程)

方法: 初始量依次叠加所有变化数值。

  • 上升、向北、收入记 正号(+)
  • 下降、向南、支出记 负号(−)

经典例题:

某地早晨气温 C,中午上升 C,晚上又下降 C,求晚上气温。

3. 盈亏、称重误差问题

题型
计算方法
总盈亏
所有收支数据直接相加(正为盈利,负为亏损)
标准重量 ± 误差
标准总重 + 误差总和
平均重量
总重量 ÷ 数据个数

经典例题:

10 袋大米,每袋标准  kg,超过记正,不足记负,误差为:,求总重量。

4. 行程与耗油问题

所求量
计算方法
最终位置
所有位移数据相加(正为东/北,负为西/南)
总路程
所有位移数据的绝对值相加
总耗油量
总路程 × 单位油耗

经典例题:

某车向东行驶  km,向西行驶  km,再向东行驶  km,每千米耗油  L,求最终位置和耗油量。

五、拓展:有理数加法推导乘法(预习)

多个相同负数连续相加,可转化为乘法。

规律:

结论
说明
负数 × 正数 = 负数
符号为负,绝对值为两数绝对值相乘
正数 × 负数 = 负数
符号为负,绝对值为两数绝对值相乘
负数 × 负数 = 正数
符号为正,绝对值为两数绝对值相乘(后续章节)

💡 总结一句话: 有理数加减运算,核心是 "减法化加法,符号看仔细,绝对值先判,凑整巧结合" ,应用问题分清差值、总量与路程,根据实际背景选择合适的运算方式。

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  1. CONNECT:[ UseTime:0.000790s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001088s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000383s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000298s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000695s ]
  6. SELECT * FROM `set` [ RunTime:0.000242s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000844s ]
  8. SELECT * FROM `article` WHERE `id` = 859217 LIMIT 1 [ RunTime:0.001509s ]
  9. UPDATE `article` SET `lasttime` = 1784850266 WHERE `id` = 859217 [ RunTime:0.014055s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000298s ]
  11. SELECT * FROM `article` WHERE `id` < 859217 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000670s ]
  12. SELECT * FROM `article` WHERE `id` > 859217 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000512s ]
  13. SELECT * FROM `article` WHERE `id` < 859217 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.027235s ]
  14. SELECT * FROM `article` WHERE `id` < 859217 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004095s ]
  15. SELECT * FROM `article` WHERE `id` < 859217 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001581s ]
0.130838s