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) 小伙子,分数写反了,照着我这个写,准没错!
2/1+6/1+12/1+20/1+30/1+42/1+56/1=?
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2/1+6/1+12/1+20/1+30/1+42/1+56/1=?
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1/2+1/6+1/12+1/20+1/30+1/42+1/56
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2/1+6/1+12/1+20/1+30/1+42/1+56/1=
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1/2+1/6+1/12+1/20+1/30+1/42+1/56
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1/2 + 1/6 + 1/12 + 1/20 + 1/30+ 1/42 + 1/56 + 1/72=
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1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72=?
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1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72=?
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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+1/56=?简便运算.
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1/2+1/6+1/12+1/20+1/30+1/42+1/56=?(要算式)