1.3.1 有理数的加法（一）
课堂学习检测
一、填空题
1．足球比赛中，甲队攻![](https://wkrtcs.bdimg.com/rtcs/image?w=3&md5sum=722a67a67686194274d290afcbdf2c52&sign=c92620e8a1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=105&ipr={"t":"img","w":"3","h":"2","dataType":"png","c":"word/media/image1.png","imgOriW":324,"imgOriH":36})
入乙队两球，同时被乙队攻入五球，则计算甲队净胜球数的算式为__________________．
2．－2的相反数与![](https://wkrtcs.bdimg.com/rtcs/image?w=25&md5sum=722a67a67686194274d290afcbdf2c52&sign=c92620e8a1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=105&ipr={"t":"img","w":"25","h":"37","dataType":"gif","c":"word/media/image2.png"})
的倒数的和的绝对值等于______．
3．在括号内填入变形的根据：
(a＋b)＋c＝a＋(b＋c![](https://wkrtcs.bdimg.com/rtcs/image?w=3&md5sum=722a67a67686194274d290afcbdf2c52&sign=c92620e8a1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=105&ipr={"t":"img","w":"3","h":"1","dataType":"png","c":"word/media/image1.png","imgOriW":324,"imgOriH":36})
)( )＝(b＋c)＋a( )．
二、选择题
4．下列运算中正确的是( )．
(A)(＋8)＋(－10)＝－(10－8)＝－2 (B)(－3)＋(－2)＝－(3－2)＝－1
(C)(－5)＋(＋6)＝＋(6＋5)＝＋11 (D)(－6)＋(－2)＝＋(6＋2)＝＋8
5．三个数－15，－5，＋10的和，比它们绝对值的和小( )．
(A)－20 (B)20 (C)－40 (D)40
6．如果两个数的和是正数，那么这两个数一定( )．
(A)都是正数 (B)只有一个正数
(C)至少有一个正数 (D)不确定
三、计算题
7．(＋8)＋(－17)＝ 8．(－17)＋(－15)＝
9．(－32.8)＋(＋51.76)＝ 10．(－3.07)＋(＋3.07)＝
11．![](https://wkrtcs.bdimg.com/rtcs/image?w=72&md5sum=722a67a67686194274d290afcbdf2c52&sign=c92620e8a1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=105&ipr={"t":"img","w":"72","h":"37","dataType":"gif","c":"word/media/image3.png"})
12．＝
![](https://wkrtcs.bdimg.com/rtcs/image?w=3&md5sum=722a67a67686194274d290afcbdf2c52&sign=c92620e8a1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=105&ipr={"t":"img","w":"3","h":"3","dataType":"png","c":"word/media/image1.png","imgOriW":324,"imgOriH":36})
13．![](https://wkrtcs.bdimg.com/rtcs/image?w=100&md5sum=722a67a67686194274d290afcbdf2c52&sign=c92620e8a1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=105&ipr={"t":"img","w":"100","h":"41","dataType":"gif","c":"word/media/image5.png"})
＝ 14．
四、解答题
15．某潜水员先潜入水下61米，然后又上升32米，通过计算说明这时潜水员处的位置.
参考答案：
1．![](https://wkrtcs.bdimg.com/rtcs/image?w=109&md5sum=722a67a67686194274d290afcbdf2c52&sign=c92620e8a1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=105&ipr={"t":"img","w":"109","h":"21","dataType":"gif","c":"word/media/image7.png"})
； 2．0； 3．加法结合律，加法交换律
4．A 5．D 6．C 7．-9 8．-32 9．18.95 10．0 11．![](https://wkrtcs.bdimg.com/rtcs/image?w=35&md5sum=722a67a67686194274d290afcbdf2c52&sign=c92620e8a1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=105&ipr={"t":"img","w":"35","h":"41","dataType":"gif","c":"word/media/image8.png"})
12．![](https://wkrtcs.bdimg.com/rtcs/image?w=44&md5sum=722a67a67686194274d290afcbdf2c52&sign=c92620e8a1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=105&ipr={"t":"img","w":"44","h":"41","dataType":"gif","c":"word/media/image9.png"})
13． 14．24.65 15．水下29米
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