问题
填空题
（1）绝对值小于4的所有整数的和是______；
（2）绝对值大于2且小于5的所有负整数的和是______．
答案
（1）绝对值小于4的所有整数为0，±1，±2，±3，
根据有理数的加法法则，互为相反数的两个数和为0，可知这7个数的和为0．
故答案为0．
（2）绝对值大于2小于5的所有负整数为-3，-4，其和为-7．
故答案为-7．
搜题请搜索小程序“爱下问搜题”
（1）绝对值小于4的所有整数的和是______；
（2）绝对值大于2且小于5的所有负整数的和是______．
（1）绝对值小于4的所有整数为0，±1，±2，±3，
根据有理数的加法法则，互为相反数的两个数和为0，可知这7个数的和为0．
故答案为0．
（2）绝对值大于2小于5的所有负整数为-3，-4，其和为-7．
故答案为-7．
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| Recently divorced in my 30s, I had no job and was on my way downtown on a rainy day to go to the employment offices. I had no umbrella, for my old one had 1 apart, and I couldn't afford another one. I sat down in the streetcar-there against the 2 was a beautiful silk umbrella with a silver handle inlaid with gold and bright enamel (珐琅). I had never seen anything so lovely. I 3 the handle and saw a name on it. The 4 procedure would have been to turn in the umbre la to the conductor, but I decided to take it and find the 5 myself. I got off the streetcar in a downpour and 6 opened the umbrella to protect myself. Then I searched a telephone book for the 7 on the umbrella and found it: I called and a lady answered. Yes, she said in 8 , that was her umbrella, which her parents, now dead, had given her as a birthday present, but it'd been 9 from her locker at school years before. She was so excited that I forgot I was looking for a job and went 10 to her house. She took the umbrella, her eyes filled with tears. I was only too happy to see her get back the lost umbrella, and get a job she offered me. | ||||
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