用适当的方法计第,并写清解题过程.
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e507a33cb1b6129aa8a4d4c962e296.png)
(2)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e507a33cb1b6129aa8a4d4c962e296.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3acad5b3cb6e29f31ba6d6f12525da6d.png)
23-24七年级上·甘肃平凉·期中 查看更多[2]
甘肃省平凉市第十中学2023-2024学年七年级上学期期中考试数学试题(已下线)清单02 有理数的运算(17种题型解读(50题))-2023-2024学年七年级数学上学期期末考点大串讲(苏科版)
更新时间:2023-10-30 19:18:56
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解答题-计算题
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适中
(0.65)
【推荐2】计算:
(1)(﹣41)+(+56)+(﹣21)+(﹣31);
(2)
+(﹣
)+
+(﹣
).
(1)(﹣41)+(+56)+(﹣21)+(﹣31);
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab44a7dc9c035687a33f6e065392359.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c6c7567972273b4ba733b47bf9d5408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6486784415f3537c9a13556c05d893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a734873a608f0c070dec80b89d179754.png)
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解答题-计算题
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适中
(0.65)
【推荐1】定义:对于任意一个有理数
,我们把
称作
的相伴数.若
,则
;若
,则
.例如:
.
(1)求
,
的值;
(2)若
,
,化简:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dc045f89c7c1442c9380c4893402664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3a34d6f60032718820c3da2b07786b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7714dfd43d1b6e29e4a0510f99adaf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed208530f74066a31c95bafca0a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57db2d46cbec4ea58f1142429a1178f9.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/295f6c63f69f083ee8f36a185d47e095.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d43f842f3d25b4fdcb620757ac2ba6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f75807858b7804a1ad2039c41f323a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb689ece3c1daaaf8edd3bbc53b8bf49.png)
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解答题-问答题
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【推荐2】阅读理解题
在求两位数乘两位数时,可以用“列竖式”的方法进行速算,例如:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/3/56cf7cc6-d711-43f7-8fe8-a155f21fc59d.png?resizew=515)
你能理解上述三题的解题思路吗?理解了,请完成:如图给出了部分速算过程,可得
,
,
,
,
,
.
在求两位数乘两位数时,可以用“列竖式”的方法进行速算,例如:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/3/56cf7cc6-d711-43f7-8fe8-a155f21fc59d.png?resizew=515)
你能理解上述三题的解题思路吗?理解了,请完成:如图给出了部分速算过程,可得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ce2b47812fce4b17fd813d0e4cce21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fba10e2b49f882c0bf86da78a2bcccae.png)
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