3.从1,2,3,4,…,20这20个自然数中任取3个不同的数,使它们成等差数列,这样的等差数列共有几个12.由0,1,2,3,4,5这6个数字组成的六位数中,个位数字小于十位数字的有几个
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![3.从1,2,3,4,…,20这20个自然数中任取3个不同的数,使它们成等差数列,这样的等差数列共有几个12.由0,1,2,3,4,5这6个数字组成的六位数中,个位数字小于十位数字的有几个](/uploads/image/z/400305-57-5.jpg?t=3.%E4%BB%8E1%2C2%2C3%2C4%2C%E2%80%A6%2C20%E8%BF%9920%E4%B8%AA%E8%87%AA%E7%84%B6%E6%95%B0%E4%B8%AD%E4%BB%BB%E5%8F%963%E4%B8%AA%E4%B8%8D%E5%90%8C%E7%9A%84%E6%95%B0%2C%E4%BD%BF%E5%AE%83%E4%BB%AC%E6%88%90%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E8%BF%99%E6%A0%B7%E7%9A%84%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E5%85%B1%E6%9C%89%E5%87%A0%E4%B8%AA12.%E7%94%B10%2C1%2C2%2C3%2C4%2C5%E8%BF%996%E4%B8%AA%E6%95%B0%E5%AD%97%E7%BB%84%E6%88%90%E7%9A%84%E5%85%AD%E4%BD%8D%E6%95%B0%E4%B8%AD%2C%E4%B8%AA%E4%BD%8D%E6%95%B0%E5%AD%97%E5%B0%8F%E4%BA%8E%E5%8D%81%E4%BD%8D%E6%95%B0%E5%AD%97%E7%9A%84%E6%9C%89%E5%87%A0%E4%B8%AA)
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