用简便方法计算:1/6+1/12+1/20+1/30+1/42

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用简便方法计算:1/6+1/12+1/20+1/30+1/42
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用简便方法计算:1/6+1/12+1/20+1/30+1/42
用简便方法计算:1/6+1/12+1/20+1/30+1/42

用简便方法计算:1/6+1/12+1/20+1/30+1/42
用简便方法计算:1/6+1/12+1/20+1/30+1/42
式=1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9
=1-1/9
=8/9
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