学帮网1/(a-1)+1/(a-1)(a-2)+1(a-2)(a-3).1/(a-99)(a-100)
来源：学生作业学帮网 编辑：学帮网 时间：2024/06/06 12:58:46
1/(a-1)+1/(a-1)(a-2)+1(a-2)(a-3).1/(a-99)(a-100)
1/(a-1)+1/(a-1)(a-2)+1(a-2)(a-3).1/(a-99)(a-100)
=1/(a-1)+1/(a-1)-1/(a-2)+1/(a-2)-1/(a-3)+.+1/(a-99)-1/(a-100)
=2/(a-1)-1/(a-100)
=[2(a-100)-2]/(a-1)(a-100)
=(2a-202)/(a-1)(a-100)
1/(a-100)
1/n(n-1)=1/(n-1)-1/n
题目=1/(a-1)+1/(a-2)-1/(a-1)+...+1/(a-100)-1/(a-99)=1/(a-100)
(a 1)(a 2)(a 3)(a
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a-1/a+2
1-a/-2-a
-2×a×1/a
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【1】a+a=a×a a= [ ]【2】a×a=a÷a a=[ ]【3】a×a=a－a a=[ ] [4]a－a=a＋a a=[ ]
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化简:-a+a/a+1