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, . ? 420. , , . , , : 420 = 42 ∙ 10. 42 10 : 42 = 6 ∙ 7, 10 = 2 ∙ 5. 6 = 2 ∙ 3, : 420 = 42 ∙ 10 = 6 ∙ 7 ∙ 2 ∙ 5 = 2 ∙ 3 ∙ 7 ∙ 2 ∙ 5 = 2 ∙ 2 ∙ 3 ∙ 5 ∙ 7. .
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- , , , ( 1) , . , 420 -? , : 420 = 15 ∙ 28. , , , ( ). , , .
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270 = 2 ∙ 33 ∙ 5 | 415 = 5 ∙ 83 | 549 = 32 ∙ 61 | 693 = 32 ∙ 7 ∙ 11 |
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, 1323 = 33 ∙ 72 63 = 32 ∙ 7 ( 2 < 3 1 < 2), 567 = 34 ∙ 7 ( 4 > 3).
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1. 29 ∙ 3 2?
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2. 29 ∙ 3 5?
. , 5.
3. 29 ∙ 3 8?
. , 8 = 23, 9 (9 > 3).
4. 29 ∙ 3 9?
. , , 9 .
5. 29 ∙ 3 6?
. , 6 = 2 ∙ 3, 2 3 .
6. , 4 3, 12?
. . , 4, 2 . 3, . 12.
7. , 4 6, 24?
. . , 12. , 4, 2; 6 , 2 3. , ( !) , , 12.
8. a 3. 3 2 a?
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9. a . , 3 a 6?
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10. 5 a 3. , a 3?
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11. 15 a 6. , a 6?
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a b b c, a c.
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