按规律填空:1/2,1/6,-1/12,1/20,1/30,-1/42,( )...( ),...第20个

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按规律填空:1/2,1/6,-1/12,1/20,1/30,-1/42,( )...( ),...第20个
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按规律填空:1/2,1/6,-1/12,1/20,1/30,-1/42,( )...( ),...第20个
按规律填空:1/2,1/6,-1/12,1/20,1/30,-1/42,( )...( ),...第20个

按规律填空:1/2,1/6,-1/12,1/20,1/30,-1/42,( )...( ),...第20个
1/2,1/6,-1/12,1/20,1/30,-1/42,( 1/56)...( 1/420),... 第20个