å设è¿ä¸ä¸ªæ¥ææ°åæ¯: x,x+7,x+14,æ°åå为:x+x+7+x+14=3x+21,
æ ¹æ®é¢æ,xâ¥1ä¸x+14â¤31,æ
1â¤xâ¤17,åå«å举ä»1å°17çæ´æ°ä»£å
¥æ±åä¸å¼,å¾å°å¯è½çç»ææ:
24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72
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