将自然数依下列方式分组 其中第一组有1个数第二组有2个数第三组有3个数 以此类推.第40组所有的数的总和是 . 题目和参考答案 Template




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tomski将自然数依下列方式分组 其中第一组有1个数第二组有2个数第三组有3个数 以此类推.第40组所有的数的总和是 coloring