1/6+1/24+1/60+1/120+1/210的简便计算
2个回答
没有吧.
如果你要答案,还是按部就班地算吧.
1/6+1/24+1/60+1/120+1/210
=140/840+35/840+14/840+7/840+4/840
=200/840=5/21
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1/6+1/24+1/60+1/120+1/210+1/336=?
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按规律填空:6,24,60,120,210,,504,1,5,8,23,47,116,257,,
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