来源：学生作业帮助网 编辑：作业帮 时间：2024/11/29 19:02:40
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1/[x(x+1)]+1/[(x+1)(x+1)]-1/[(x+2)(x+1)]-1/[(x+3)(x+1)]=1/(x+1)[1/x+1/(x+1)-1/(x+2)-1/(x+3)]=4/[x(x+1)(x+3)]
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