题干
在整数1～20中．
奇数有____，偶数有____,质数有____，合数有____
答案(点此获取答案解析）
1\uff0c3\uff0c5\uff0c7\uff0c9\uff0c11\uff0c13\uff0c15\uff0c17\uff0c19,2\uff0c4\uff0c6\uff0c8\uff0c10\uff0c12\uff0c14\uff0c16\uff0c18\uff0c20,2\uff0c3\uff0c5\uff0c7\uff0c11\uff0c13\uff0c17\uff0c19,4\uff0c6\uff0c8\uff0c9\uff0c10\uff0c12\uff0c14\uff0
