1+2+3=63+5+7=155+8+11=247+11+15=33问:第三个加数是7971的算式是第几个算式?那个算式是什么.(求讲解过程和列式)(2)1/n+(n+1)=1/k × (1/n - 1/n+k)写出5个符合以上等式的算式.
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![1+2+3=63+5+7=155+8+11=247+11+15=33问:第三个加数是7971的算式是第几个算式?那个算式是什么.(求讲解过程和列式)(2)1/n+(n+1)=1/k × (1/n - 1/n+k)写出5个符合以上等式的算式.](/uploads/image/z/1768924-28-4.jpg?t=1%2B2%2B3%3D63%2B5%2B7%3D155%2B8%2B11%3D247%2B11%2B15%3D33%E9%97%AE%EF%BC%9A%E7%AC%AC%E4%B8%89%E4%B8%AA%E5%8A%A0%E6%95%B0%E6%98%AF7971%E7%9A%84%E7%AE%97%E5%BC%8F%E6%98%AF%E7%AC%AC%E5%87%A0%E4%B8%AA%E7%AE%97%E5%BC%8F%3F%E9%82%A3%E4%B8%AA%E7%AE%97%E5%BC%8F%E6%98%AF%E4%BB%80%E4%B9%88.%EF%BC%88%E6%B1%82%E8%AE%B2%E8%A7%A3%E8%BF%87%E7%A8%8B%E5%92%8C%E5%88%97%E5%BC%8F%EF%BC%89%EF%BC%882%EF%BC%891%2Fn%2B%28n%2B1%29%3D1%2Fk+%C3%97+%281%2Fn+-+1%2Fn%2Bk%29%E5%86%99%E5%87%BA5%E4%B8%AA%E7%AC%A6%E5%90%88%E4%BB%A5%E4%B8%8A%E7%AD%89%E5%BC%8F%E7%9A%84%E7%AE%97%E5%BC%8F.)
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