2. ϳ . 2 4 = 8. ? ?
. . 2 2, , 4, 5, 6, 7, 8 9, 2.
2 2? (4.) ? (2 + 2 = 4.) 2 3? (6.) ? (2 + 2 + 2 = 6.)
2 . , (. 20).
20
2 - | (-2 | 2 = 4 | |||||
2- | 1- 2- | 1- 2 | 3 = 6 | ||||
2 - | (- 2 - | 2 - | 2 | 4 = 8 | |||
2- | 2 - | 1-2 - | *- 2- | 1-2 | 5= 10 | ||
2 - | - 2 - | 1- 2 - | - 2 - | *■ 2 | + 2 | 6= 12 | |
2- | 1- 2- | 1- 2 - | - 2 - | 1- 2 | + 2 + 2 | 7= 14 | |
2- | -2 | -2 | -2 -+ | -24 | -2+2+2 | 8=16 | |
2- | 2 | -■2- | -24 | -24 | -2+2+2+2 | ■9= 18 |
2 : , 2; 2; ' . ^ .
, :
1. , :
2-5+10; 2-7-7; 2-7-5.
2. , ' .
. 6- ? :
1. 2 ( ). , , 2 6 = 12.
2. 2 :
2-2 | 2-3 | 2-4 | 2-5 | 2-6 | 2-7 | 2-8 | 2-9 |
". 2, | :
4. 2 '.
5. ' 2, (2 ■ 9, 2 8 . .).
6. . , 2 5? 9? 7?
7. 2 (4, 6, 8,..., 18). :
1. ':
2-7= 14 14 + 5= 19
2. :
2 + 2 + 2 + 2 + 9; 2 + 2 + 2 + 2 + 2-7.
3. :
2-9 + 5; 2-7-8; 2-3-6.
4. :
2-9[]12; 2-7[]2 + 7; 2-6[]6 + 6. '
5. 4 2 . 3 . ?
6. 4 2 ., 3 . . ?
2. , 䳿 . ij ' , . , '.
|
|
2-6=12 : 12:2 = 6. 2. 2, 2.:2 = 2 2 = 2 = 4 2 = 5 2 = 6 2 = 7 2 = 8 2 = 9
2 , ' 1-2 . 2 ' . 2. , : 2, 2.
, 2 .
2-2 = 4 | 4: |
2-3 = 6 | 6: |
2-4 = 8 | 8: |
2 5 = 10 | |
2-6= 12 | |
2 7 = 14 | |
2-8= 16 | |
2-9= 18 |
'. , ' - . () . :
1. 6 . '. ■ 2. ' 50, 70.
3. , ' 8, :
4. 9.
5. 8.
6. , 8 : 14, 21,!,...; 12, 18, 24,....
7. :
8. 10, 12, 16, 20, 24, 28, 32, 36; 16, 24, 32, 40, 48, 54, 56, 64, 72.
. : 1.6 8 = 48. ?
2. , 5 7 + 5 = 40.
3. 7.
7 8 = 56 7 4 = 28
4. , 72: 9 = 8?
. . . .