裂项相消1/4×5+1/5*6+……+1/11*12
=1/4-1/5+1/5-1/6+……+1/11-1/12
=1/4-1/12=1/6
一定要采纳啊,打得很费劲
1/20+1/30+1/42+1/56+.+1/132应该怎么算呢?
3个回答
相关问题
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简算!help me1/20(二十分之一)+1/30+1/42+1/56+…………+1/132
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1/20+1/30+1/42······+1/132 简算 帮帮忙!
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[1/20]+[1/30]+[1/42]+…+[1/132]．
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1/20+1/30+1/42+……+1/132
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[1/20]+[1/30]+[1/42]+…+[1/132]．
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简算1/12+1/20+1/30+1/42+1/56
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1/2+1/6+1/20+1/30+1/42+1/56+1/72=怎么算简便?
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42/1+56/1+72/1+90/1+110/1+132/1,用简便方法怎么算?
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1+1/2+1/6+1/12+1/20+1/30+1/42+1/56+……+1/132不通分解答
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1/20+1/30+1/42+.+1/132+1/156=