2 18 31 95 73 196 57 0 1 15 29 3 48 556 78 306 5 1011 277 83 99 38 286 90哪些是质数哪些是合数?还有既是奇数又是质数，既是奇数又是合数，既是偶数又是质数？到底分别是哪些数？

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21831957319657011529348556783065101127783993828690哪些是质数哪些是合数?还有既是奇数又是质数，既是奇数又是合数，既是偶数又是质数？到底分别是哪些数？2

2 18 31 95 73 196 57 0 1 15 29 3 48 556 78 306 5 1011 277 83 99 38 286 90哪些是质数哪些是合数?还有既是奇数又是质数，既是奇数又是合数，既是偶数又是质数？到底分别是哪些数？
2 18 31 95 73 196 57 0 1 15 29 3 48 556 78 306 5 1011 277 83 99 38 286 90哪些是质数哪些是合数?
还有既是奇数又是质数，既是奇数又是合数，既是偶数又是质数？到底分别是哪些数？

2 18 31 95 73 196 57 0 1 15 29 3 48 556 78 306 5 1011 277 83 99 38 286 90哪些是质数哪些是合数?还有既是奇数又是质数，既是奇数又是合数，既是偶数又是质数？到底分别是哪些数？
质数：2,31,73,29,3,5,277,83.不是质数也不是合数：0,1.其余是合数.楼主,加分啊!

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只要知道质数的定义就好办了啊。质数就是只能被1和自己整除的数。质数都选好了那剩下的就是合数了呗。

分类填数（选择全面）2 18 31 95 73 196 57 0 1 15 29 31 3 48 556 78 306 5 1011 277 83 286 90 奇数：偶数：质数：合数：2的倍数：3的倍数：5的倍数：既是奇数又是质数:既是奇数又是合数:既是偶数又是质数 2 18 31 95 73 196 57 0 1 15 29 3 48 556 78 306 5 1011 277 83 99 38 286 90哪些是质数哪些是合数?还有既是奇数又是质数，既是奇数又是合数，既是偶数又是质数？到底分别是哪些数？ 3/2+7/6+13/12-21/20+31/30-43/42+57/56+73/72 73*57*31的黄铜板重量是多少! 21,13,17,24,2,31,43,37,67,73,41,15,83,93,27,61,73,11,57,99质数（）合数（） 21,13,17,24,2,31,43,37,67,73,41,15,84,93,27,61,73,11,57,99偶数有哪些,合数呢等比数列 2 31 80 136 196 2 31 80 136 196 （） 84,86,95,47,18,68,57的平均数是多少? 简便计算73*(1/27+2/31)*31 英语翻译58个学生.65个班级.13本书.73张桌子.27个男生.31个女生.15台电脑.82岁.44位老师.94位医生.几只鸟.多少幅画.3本字典.一些风筝.2个图书馆.12个月.57岁.13辆公交车.18个妇女.22个孩子.六杯茶. 2,2,7,18,31,90,(),括号里应该填?a.57 b.69 c.86 d.79 21 36 33 16 73 29 35 39 49 24 67 19 18 57 质数：合数: 7/6 + 13/12 +21/20+31/30+43/42+57/56+73/72+91/90 简便计算 7/6+13/12+21/20+30/31+42/43+57/56+73/72+91/90=? 找规律：31 7 23 3 9 3 8 8 5 7 831 73 823 38 57 8 求数列1,3+7,13+21+31,43+57+73+91,.的第21项中的第12个数. 7/6+13/12+21/20+31/30+43/42+57/56+73/72+93/92=?