1+3+1/6+5+1/12+7+1/20+9+1/30+11+1/42+13+1/56+15+1/72+19+1/90
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整理原式,得
1+3+5+7+9+11+13+15+19+1/6+1/12+1/20+1/30+1/56+1/72+1/90
=4（1+15）+19+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9+1/9*10
=64+19+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+1/9-1/10
=83+1/2-1/10
=83.4
1+3+5+7+9+11+13+15+19+1/6+1/12+1/20+1/30+1/56+1/72+1/90
=4（1+15）+19+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9+1/9*10
=64+19+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+1/9-1/10
=83+1/2-1/10
=83.4
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