B=1/1x4+1/4x3+1/3x8+...+1/7x16+1/16x9+1/9x20
2B=2x(1/4+1/12+1/24+...+1/112+1/144+1/180
2B=2/8+2/24+2/48+...+2/224+2/288+2/360
2B=2/2x4+2/4x6+2/6x8+...+2/14x16+2/16x18+2/18x20
2B=1/2-1/4+1/4-1/6+1/6-1/8+...+1/14-1/16+1/16-1/18+1/18-1/20
2B=1/2-1/20
2B=9/20
B=9/20:2
B=9/40