问题描述:
1/2+1/6+1/12+1/20+1/30
最佳答案:
解:
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)+……+(1/5-1/6)
=1-1/6
=5/6
简便计算:1/2+1/6+1/12+1/20+1/30
问题描述:
1/2+1/6+1/12+1/20+1/30
解:
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)+……+(1/5-1/6)
=1-1/6
=5/6