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# ????? - PowerPoint PPT Presentation

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## PowerPoint Slideshow about '?????' - quamar-phillips

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Presentation Transcript

1

1

1,2

2

1,3

2

3

1,2,4

2

1,5

1,2,3,6

4

2

1,7

1,2,4,8

4

3

1,3,9

4

1,2,5,10

2

1,11

1,2,3,4,6,12

6

2

1,13

4

1,2,7,14

4

1,3,5,15

5

1,2,4,8,16

2

1,17

1,2,3,6,9,18

6

2

1,19

6

1,2,4,5,10,20

1既不是质数，也不是合数。

4

9

6

8

5

2

3

12

14

10

1

13

11

7

18

16

15

19

17

20

1、 划去1；

2、划去除2外所有2的

3、划掉除3,5,7外所有3,

5,7的倍数,剩下的就

1 2 3 4 5 6 7 8 9 10

11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30

31 32 33 34 35 36 37 38 39 40

41 42 43 44 45 46 47 48 49 50

51 52 53 54 55 56 57 58 59 60

61 62 63 64 65 66 67 68 69 70

71 72 73 74 75 76 77 78 79 80

81 82 83 84 85 86 87 88 89 90

91 92 93 94 95 96 97 98 99 100

3.这是个最大的一位数，它是奇数，还是合数。

2.这是10以内最大的质数。

1.这是比3大，比7小的奇数。