1/2=1-1/2 1/6=1/2-1/3 1/12=1/3-1/4...根据上述规律计算下题:1/2+1/6+1/12+1/20+1/30=

问题描述:

1/2=1-1/2 1/6=1/2-1/3 1/12=1/3-1/4...根据上述规律计算下题:1/2+1/6+1/12+1/20+1/30=