1/2+1/6+1/12+1/20+1/30+1/42+1/56
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8
=1-1/8
=7/8
1/2+1/6+1/12+1/20+1/30+1/42+1/56等于多少,/前面是分子后面分母
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相关问题
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计算1/2-1/6-1/12-1/20-1/30-1/42-1/56等于多少?
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1/2+1/6+1/12+1/20+1/30+1/42+1/56
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1/12+1/20+1/30+1/42+1/56最终等于几?