.
22 + 34 | 58 + 37 | |
63 + 25 | 34 + 23 | |
49 + 27 | 62 + 26 |
.
.
IV. .
1. 1, 2.
, .
27 + 34 = (20 + 7) + (30 + 4) = (20 + 30) + (7 + 4) = 50 + 11 = 61
27 34. (20 30.)
20 30? (50.)
50 ? (.)
27 34. (7 4.)
7 4? (11.)
11 ? (.)
11 . , .
: ? ( .)
2. 3.
, .
36 + 45 = (30 + 6) + (40 + 5) = (30 + 40) + (6 + 5) = 70 + 11 = 81
64 + 26 = (60 + 4) + (20 + 6) = (60 + 20) + (4 + 6) = 80 + 10 = 90
75 + 18 = (70 + 5) + (10 + 8) = (70 + 10) + (5 + 8) = 80 + 13 = 93
54 + 39 = (50 + 4) + (30 + 9) = (50 + 30) + (4 + 9) = 80 + 13 = 93
3. 4.
.
27 + 35 = (20 + 7) + (30 + 5) = (20 + 30) + (7 + 5) = 50 + 12 = 62
4. 5.
.
.
, .
:
38 .
27 .
? .
:
38 + 27 = 65 (.) .
: 65 .
5. 6.
, .
.
54 + 38 = (50 + 4) + (30 + 8) = (50+ 30) + (4 + 8) = 80 + 12 = 92
27 + 55 = (20 + 7) + (50 + 5) = (20 + 50) + (7 + 5) = 70 + 12 = 82
73 + 17 = (70 + 3) + (10 + 7) = (70 + 10) + (3 + 7) = 80 + 10 = 90
4. .
1. + , .
79 50 6 = 23 | 18 60 40 = 38 |
45 5 30 = 10 | 51 40 30 = 61 |
10 6 80 = 84 | 89 6 2 = 81 |
7 3 57 = 67 | 8 2 7 = 17 |
2. .
12 , 10. . ?
V. .
?
?
: .
39
: ; ; .
|
|
I. .
II. .
1. :
17 = 14 | 12 = 19 | 4 5 3 = 6 |
13 = 13 | 9 = 18 | 8 7 9 = 6 |
2. ?
3. , . !
37 + 25 | 49 + 37 | 58 + 18 |
37 + 23 | 49 + 32 | 58 + 16 |
37 + 26 | 49 + 36 | 58 + 19 |
37 + 28 | 49 + 38 | 58 + 14 |
37 + 27 | 49 + 39 | 58 + 13 |
37 + 24 | 49 + 31 | 58 + 12 |
4. .
: ?
, . , .
?