（1/8+1/24+1/48+1/80+1/120+1/168+1/224+1/288）*128
=（1/2+1/6+1/12+1/20+1/30+1/42+14/56+1/72）*32
=（1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9）*32
=（1-1/9）*32
=8/9*32
=256/9
=(1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10+1/10-1/12+1/12-1/14+1/14-1/16+1/16-1/18)*128
=(1/2-1/18)*128
=(8/18)*128
=4*128/9
=512/9
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