1/2+1/6+1/12+1/20+1/30等于多少?并且变方法计算。
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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
=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
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