.
41 + 5 | 65 + 6 | |
42 + 5 | 65 + 5 | |
43 + 5 | 65 + 4 | |
44 + 5 | 65 + 3 | |
45 + 5 | 65 + 2 | |
46 + 5 | 65 + 1 |
.
.
IV. .
1. 1.
. , .
45 + 7 = (40 + 5) + 7 = 40 + (5 + 7) = 40 + 12 = 52
? ( .)
? (.)
?
( 12.)
12 ?
( .)
: . .
.
2. 2.
, .
36 + 7 = (30 + 6) + 7 = 30 + (6 + 7) = 30 + 13 = 43
48 + 5 = (40 + 8) + 5 = 40 + (8 + 5) = 40 + 13 = 53
64 + 8 = (60 + 4) + 8 = 60 + (4 + 8) = 60 + 12 = 72
73 + 9 = (70 + 3) + 9 = 70 + (3 + 9) = 70 + 12 = 82
3. 3.
.
36 + 7 = 36 + (4 + 3) = (36 + 4) + 3 = 40 + 3 = 43
48 + 5 = 48 + (2 + 3) = (48 + 2) + 3 = 50 + 3 = 53
64 + 8 = 64 + (6 + 2) = (64 + 6) + 2 = 70 + 2 = 72
73 + 9 = 73 + (7 + 2) = (73 + 7) + 2 = 80 + 2 = 82
4. 4.
, 25 + 8.
:
25 .
8 .
? .
: 25 + 8 = 33 (.) .
: 33 .
5. 5.
.
? ?
, .
1- 18 .
2- 6 .
? .
: 18 + 6 = 24 (.) .
: 24 .
6. 7.
.
?
.
+ ( + ) ( ) + + ( )
7 + (30 + 14) = 51 (68 40) + 3 = 31 4 + (89 20) = 83
9 + (54 + 20) = 83 (57 30) + 6 = 33 5 + (75 40) = 40
7. 8.
.
:
26 .
8 .
? .
:
26 + 8 = 34 () .
: 34 .
V. .
?
?
: , . 58, 6.
28
: ; ; ; ; .
|
|
I. .
II. .
1. , :
) 3, 8, 38, 4, 7, 47, 5, 6, 56,
) 3, 5, 53, 4, 6, 64, 5, 7, 75,
) 35, 38, 41, 44, 47, 50,
2. , :
3 + = 9 | + 4 = 94 | 4 + = 7 |
7 + = 8 | + 7 = 67 | 3 + = 6 |
2 + = 5 | + 5 = 85 | 3 + = 33 |
3. .
60 , 20. ?
4. ?
III. .
.
40 6 | 39 5 | |
27 6 | 86 5 | |
89 6 | 70 5 | |
67 6 | 57 5 |
?
.
IV. .
1. 1.
?
. .
37 + 3 = 40 55 + 5 = 60 63 + 7 =70
24 + 6 = 30 31 + 9 = 40 76 + 4 =80
48 + 2 = 50 82 + 8 = 90
2. 2.
, . .
37 + 3 = 40 40 3 = 37
31 + 9 = 40 40 9 = 31
24 + 6 = 30 30 6 = 24
82 + 8 = 90 90 8 = 82
48 + 2 = 50 50 2 = 48
63 + 7 = 70 70 7 = 63
76 + 4 = 80 80 4 = 76
?
3. 3.
.
4. 4.
, .
40 3 = (30 + 10) 3 = 30 + (10 3) = 30 + 7 = 37
.
70 3 = (60 + 10) 3 = 60 + (10 3) = 60 + 7 = 67
60 2 = (50 + 10) 2 = 50 + (10 2) = 50 + 8 = 58
70 8 = (60 + 10) 8 = 60 + (10 8) = 60 + 2 = 62
40 7 = (30 + 10) 7 = 30 + (10 7) = 30 + 3 = 33
50 4 = (40 + 10) 4 = 40 + (10 4) = 40 + 4 = 44
5. 5.
, , 7.
.
20 7 = 13
30 7 = 23
40 7 = 33
50 7 = 43
60 7 = 53
. ( 1.)
6. 6.
, . .
50 4 > 50 8 70 7 < 70 2 80 4 > 70 4
, .
7. 7.
, 30 8.
:
30 .
8 .
? .
:
30 8 = 22 (.) .
: 22 .
, .
8. .
, , 13.
V. .
?
?
: , 50 7.
|
|
29
: ; ; ; .