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有理数1.1正数和负数,基础和拓展习题

有理数1.1正数和负数,基础和拓展习题
习题答案见最后

1.1 正数和负数 完整知识点整理(七年级上册有理数)

一、核心基础概念

1. 正数、负数定义

1. 正数:大于0的数,数字前可带“+”(通常省略不写),例:3、1/4、π、2.05。
2. 负数:在正数前面加符号“-”(负号)的数,小于0,例:-1/4、-1.25、-3、-0.03。
3. 0的特殊地位(高频易错
- 0既不是正数,也不是负数;
- 0是正数和负数的分界;
- 0是自然数;
- 0不单纯代表“什么都没有”:如0℃是一个确定温度,不是没有温度;海拔0m代表海平面基准。

2. 判断正负的易错坑

- 不带“-”的数不一定是正数:0不带负号,但不是正数;
- a为正数→ -a一定是负数;
- 不存在既不是正数也不是负数的数只有0。

二、相反意义的量(考试必考

1. 定义

成对出现、意义完全相反的两类量,可用正、负区分。

2. 判定标准(缺一不可

① 同一类量;② 意义相反。
✅ 正确例子:上升5°和下降5°、盈利和亏损、上车和下车、上升高度和下降高度、超过标准和不足标准
❌ 错误例子:盈利200元和支出300元(不是同类量);走100米和跑100米(意义不相反)

3. 书写规则

先规定其中一种为正,相反的就为负:

- 例:上车2人记作+2,则-3表示下车3人;
- 以2.00m跳远为标准,1.80m记作-0.20m,2.30m记作+0.30m;
- 上升记+,下降记-。

三、数字规律、数轴类拓展知识点

1. 正负数字排列规律

观察图形循环规律:

- 箭头向右、向下的偶数位置:正数;
- 箭头向左、向上的奇数位置:负数;
- 拐角A、B位置永远是正数,C、D永远是负数。

2. 时差正负应用

规定:正数=比北京时间早,负数=比北京时间晚。
计算当地时间:北京时间+时差。

四、数形结合:网格坐标正负行走规则

规定:

1. 左右方向:向右+,向左-;
2. 上下方向:向上+,向下-;
3. 书写格式:(左右步数,上下步数);
4. 总路程:所有步数数字直接相加,正负不影响路程长度。

五、实际应用题考点

1. 标准偏差问题(乒乓球直径、跳远基准)
标准数值±误差;大于标准记正,小于标准记负。
例:标准40mm,小于标准0.03mm记作-0.03mm。
2. 统计盈亏/分拣包裹
超过计划+,不足计划-;

- 最多、最少差值=最大正数-最小负数;
- 总实际量=每日计划总和+所有正负偏差相加。

3. 翻转茶杯逻辑题
通过正负代表杯口朝向,推理最少翻转次数。

六、全章节易错点汇总

1. 忽略0不是正数、不是负数,误以为不带负号都是正数;
2. 判断相反意义的量时混淆“同类量”,把支出和盈利当成相反量;
3. 计算时差、高度变化时符号加减出错;
4. 网格路程计算时漏掉负号对应的步数(路程只看数字大小);
5. 规律题分不清A、B、C、D位置正负;
6. 标准基准题搞反正负:低于标准记作正数、高于记作负数。

七、答题万能模板

1. 判断负数:找出所有<0、带负号且不为0的数字;
2. 相反意义量答题:先定标准,相反意义直接加负号;
3. 差值计算:最大值-最小值;
4. 时差计算:北京时间+城市时差;
5. 网格路线:右/上为+,左/下为-,路程取各数绝对值求和。

习题答案:

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  1. CONNECT:[ UseTime:0.000430s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000546s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001509s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000847s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000599s ]
  6. SELECT * FROM `set` [ RunTime:0.000814s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000612s ]
  8. SELECT * FROM `article` WHERE `id` = 827863 LIMIT 1 [ RunTime:0.010365s ]
  9. UPDATE `article` SET `lasttime` = 1784858952 WHERE `id` = 827863 [ RunTime:0.006107s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.003009s ]
  11. SELECT * FROM `article` WHERE `id` < 827863 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002348s ]
  12. SELECT * FROM `article` WHERE `id` > 827863 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005028s ]
  13. SELECT * FROM `article` WHERE `id` < 827863 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.018619s ]
  14. SELECT * FROM `article` WHERE `id` < 827863 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.020864s ]
  15. SELECT * FROM `article` WHERE `id` < 827863 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.020580s ]
0.176438s