已知:1-1⼀2=1⼀2,1⼀2-1⼀3=1⼀6,1⼀3-1⼀4=1⼀12,求1⼀2+1⼀6+1⼀12+1⼀20+1⼀30.

解答过程
2024-12-29 10:59:42
推荐回答(4个)
回答1:

解答:
1/2+1/6+1/12+1/20+1/30
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
=1-1/6
=5/6

回答2:

1-1/2+1/2-1+1/3-1/4+1/20+1/30
=1/2+1/2-1+1/12+1/20+1/30
=1/12+1/20+1/30
=1/6

好辛苦....~~~~

回答3:

1-1\2+1\2-1\3...+1\5-1\6
1-1\6
5\6

回答4:

已知:1-1/2=1/2,1/2-1/3=1/6,1/3-1/4=1/12,求1/2+1/6+1/12+1/20+1/30.
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