=(1-1/2）+(1/2-1/3）+（1/3-1/4）+（1/4-1/5)+(1/5-1/6）+（1/6-1/7)
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7
=1-1/7
=6/7
1/2 + 1/6 + 1/12 +1/20 + 1/30 +1/42等于多少,
3个回答
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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2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1等于多少
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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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1/6+1/12+1/20+1/30+1/42+1/56=多少
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1/2-1/6-1/12-1/20-1/30-1/42
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1/2+1/6+1/12+1/20+1/30+1/42=?
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1/2+1/6+1/12+1/20+1/30+1/42=
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计算-1/2-1/6-1/12-1/20-1/30-1/42
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1/6+12/1+20/1+30/1+42/1=
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1/6+1/12+1/20+1/30+1/42