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=(1+3+5+7+9+11)+(1/6+1/12+1/20+1/30+1/42)=(1+11)×6÷2+[1/(2×3)+1/(3×4)+1/(4×5)+1/(5×6)+1/(6×7)]=36+(1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7)=36+(1/2-1/7)=36+5/14=36又14分之5
