æ们è¿æ¯5æ¯åæ£é¢A4ç ï¼ä¹¦çæ»é¡µç é¤ä»¥2ï¼åä¹ä»¥0.5ï¼å°±æ¯å¤å°çæ»ä»·æ ¼æï¼
84/2=42,42*0.5=21,æ便å®æäºæ¯é±ç®ä¹å¾21åé±ï¼éä»·ä¹å°±å个ä¸ä¸¤åé±ã
å¦æ书ä¸æ¯å¾è´µï¼æ²¡æ买书åéçã
å°åºå°æ®µä¸åå¸åºä»·ä¹ä¼æææ¬æ®ï¼æçå°ä¼å¾è´µã
温馨提示:答案为网友推荐,仅供参考