1/2+1/6+1/12+1/20+1/30等于多少？并且变方法计算。

1/2+1/6+1/12+1/20+1/30
=1/（1x2）+1/（2x3）+1/（3x4）+1/（4x5）+1/（5x6）
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
=1-1/6
=5/6本回答被网友采纳