问题描述: 数码之和为15的三位数(如:915、276、456等)共有多少个? 1个回答 分类:数学 2014-10-05 问题解答: 我来补答 一共有 69个 再问: 过程有没有? 再答: 只能列举出来了,分别是 159,168,177,186,195 249,258,267,276,285,294 339,348,357,366,375,384,393 429,438,447,456,465,474,483,492 519,528,537,546,555,564,573,582,591 609,618,627,636,645,645,663,672,681,690 708,717,726,735,744,753,762,771,780 807,816,825,834,843,852,861,870 906,915,924,933,942,951,960 展开全文阅读