排列组合问题,从2,3,4,7,9这五个数字任取3个,组成没有重复数字的三位数, 问:这些三位数的和是多少?求解题思路!这个偶很是想不通!
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![排列组合问题,从2,3,4,7,9这五个数字任取3个,组成没有重复数字的三位数, 问:这些三位数的和是多少?求解题思路!这个偶很是想不通!](/uploads/image/z/352466-26-6.jpg?t=%E6%8E%92%E5%88%97%E7%BB%84%E5%90%88%E9%97%AE%E9%A2%98%2C%E4%BB%8E2%2C3%2C4%2C7%2C9%E8%BF%99%E4%BA%94%E4%B8%AA%E6%95%B0%E5%AD%97%E4%BB%BB%E5%8F%963%E4%B8%AA%2C%E7%BB%84%E6%88%90%E6%B2%A1%E6%9C%89%E9%87%8D%E5%A4%8D%E6%95%B0%E5%AD%97%E7%9A%84%E4%B8%89%E4%BD%8D%E6%95%B0%2C+%E9%97%AE%EF%BC%9A%E8%BF%99%E4%BA%9B%E4%B8%89%E4%BD%8D%E6%95%B0%E7%9A%84%E5%92%8C%E6%98%AF%E5%A4%9A%E5%B0%91%3F%E6%B1%82%E8%A7%A3%E9%A2%98%E6%80%9D%E8%B7%AF%21%E8%BF%99%E4%B8%AA%E5%81%B6%E5%BE%88%E6%98%AF%E6%83%B3%E4%B8%8D%E9%80%9A%21)
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