1-1/2+1/6+1/12+1/20+1/30+1/42必须用简便方法
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1-1/2+1/6+1/12+1/20+1/30+1/42必须用简便方法
你好
1-1/2+1/6+1/12+1/20+1/30+1/42
=1-1/2+(1/2-1/3)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)
=1-1/2+1/2-1/3+1/4-1/5+1/5-1/6+1/6-1/7
=1-1/7
=6/7
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再答: 哈哈,谢谢
1-1/2+1/6+1/12+1/20+1/30+1/42
=1-1/2+(1/2-1/3)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)
=1-1/2+1/2-1/3+1/4-1/5+1/5-1/6+1/6-1/7
=1-1/7
=6/7
【数学辅导团】为您解答,如果本题有什么不明白可以追问,如果满意记得采纳
祝学习进步!
再问: 3克油!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!! !!! !!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
再答: 哈哈,谢谢
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