1/3+1/15=2/5 1/4+1/7+1/28=3/7 有1/2,1/3,1/4,1/5.1/90,1/91 ,从中挑出10个,加上正负号,使它们的和等于-1

来源：学生作业帮助网 编辑：作业帮 时间：2024/09/11 22:23:40
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