1/2+1/6+1/12+1/20+1/30+1/42
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7
=1-1/7
=6/7
我是老师 谢谢采纳
1/2+1/6+1/12+1/20+1/30+1/42=
5个回答
相关问题
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1/2-1/6-1/12-1/20-1/30-1/42
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1/2+1/6+1/12+1/20+1/30+1/42=?
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计算-1/2-1/6-1/12-1/20-1/30-1/42
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1/6+12/1+20/1+30/1+42/1=
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1/6+1/12+1/20+1/30+1/42
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1/6+1/12+1/20+1/30+1/42
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1/2+1/6+1/12+1/20+1/30+1/42+……+1/110=?
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2/1+6/1+12/1+20/1+30/1+42/1+56/1=?
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1/2+1/6+1/12+1/20+1/30+1/42+1/56
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2/1+6/1+12/1+20/1+30/1+42/1+56/1=?