1+1/2+1/4+1/8+1/14+1/22+1/32+1/44+1/58+1/74
=2-1/8+1/32+1/（2*7）+1/（2*11）+1/（4*11）+1/（2*29）+1/（2*37）
=2+(-330484+82621+188848+120176+60088+45584+35728)/(32*7*11*29*37)
=2+202561/2643872.