2/1乘360+6/1乘360+12/1乘360+20/1乘360+30/1乘360简算

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2/1乘360+6/1乘360+12/1乘360+20/1乘360+30/1乘360简算2/1乘360+6/1乘360+12/1乘360+20/1乘360+30/1乘360简算2/1乘360+6/1乘

2/1乘360+6/1乘360+12/1乘360+20/1乘360+30/1乘360简算
2/1乘360+6/1乘360+12/1乘360+20/1乘360+30/1乘360
简算

2/1乘360+6/1乘360+12/1乘360+20/1乘360+30/1乘360简算
=360*(1/2+1/6+1/12+1/20+1/30) =360*[(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)] =360*(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6) =360*(1-1/6) =360*5/6 =300