1/6加1/12加1/20加1/30加1/42加1/56加1/72加1/90等于

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1/6加1/12加1/20加1/30加1/42加1/56加1/72加1/90等于
1/6加1/12加1/20加1/30加1/42加1/56加1/72加1/90等于

1/6加1/12加1/20加1/30加1/42加1/56加1/72加1/90等于
1/2-1/3+1/3-1/4……+1/9-1/10
=1/2-1/10
=2/5

2/5或0.4