II. .
1. ?
?
?
12 13 | 62 26 | 42 62 |
13 14 | 37 73 | 57 79 |
2. ?
) 90, 60, 70, 40, 50, 20, 30, 0, 10;
) 10, 30, 20, 40, 30, 50, 40, 60, 50.
3. :
30 + 20 40 + 60 50 + 20 + 40 =
80 30 10 + 50 70 + 60 80 =
90 60 + 20 40 + 60 + 20 50 =
30 + 40 60 + 80 20 60 + 10 =
20 + 70 50 + 30 60 + 80 90 =
III. .
.
46 4 | 27 5 | |
57 9 | 48 6 | |
86 3 | 92 4 | |
94 2 | 78 6 |
.
.
IV. .
1. 1.
, .
14 7 = 7
15 9 = 6
14 6 = 8
2. 2.
. .
20 + 4 = 10 + 14
30 + 6 = 20 + 16
40 + 18 = 50 + 8
.
3. 3.
20 + 4 1 , 10.
(20 10) + (4 + 10) = 20 + 4
, 20 + 4? ( 1 . .)
4. 4.
, .
24 7 = (20 + 4) 7 = (10 + 14) 7 = 10 + (14 7) = 10 + 7 = 17
? ( , , 7.)
.
5. 5.
.
34 7 = (20 + 14) 7 = 20 + (14 7) = 20 + 7 = 27
63 6 = (50 + 13) 6 = 50 + (13 6) = 50 + 7 = 57
52 5 = (40 + 12) 5 = 40 + (12 5) = 40 + 7 = 47
45 6 = (30 + 15) 6 = 30 + (15 6) = 30 + 9 = 39
71 9 = (60 + 11) 9 = 60 + (11 9) = 60 + 2 = 62
96 8 = (80 + 16) 8 = 80 + (16 8) = 80 + 8 = 88
6. 6.
?
? ( .)
.
7. 7.
, 23 8.
:
23 .
8 .
? .
:
23 8 = 15 (.) .
: 15 .
V. .
?
?
|
|
: .
30
: : ; ; .
I. .
II. .
1. .
.
10 . ? | 40 . ? |
?
?
, ?
2. . ?
?
3. ? ?
4. , .
I (1, 4, 6) , ;
II (2, 3, 5) , .
?
?