I. .
II. .
7.
. , , ; , , , .
III. .
1 . 21.
3 . 1- 7. 2- 3- , 7. : 7 6 1.
7 2 _.
7 1 _.
7 5 _.
IV. .
1. 7, 8 9 1 . 94.
2. 7, 8, 9 .
1. 2 . 94 .
, 7. ( 10 .)
7 + 7 =
7 , 10, . 7 3 4, 7 + 3 = 10, 10 + 4 = 14, , 7 + 7 = 14.
.
2. 2 . 94.
? (8 8. 8 , 10, . 8 + 8 = ÿ; 8 2 6, 8 + 2 = 10, 10 + 6 = 16, , 8 + 8 = 16.)
3. 4 . 94 .
4. 3 . 94 .
V. .
1. ( 12, . 97).
2. : 11, . 96.
3. .
2, . 27 ( ).
VI. .
? ?
102
7, 8, 9
: 7, 8, 9 ; , .
I. .
II. .
1. .
.
1-
6 + 5 = 9 + 3 = 4 + 9 = | 5 + 7 = 9 + 8 = 7 + 5 = | 5 + 8 = 7 + 7 = 8 + 3 = | 3 + 8 = 9 + 6 = 6 + 9 = |
2-
6 + 6 = 8 + 6 = 4 + 7 = | 7 + 9 = 8 + 8 = 2 + 1 = | 9 + 9 = 7 + 6 = 3 + 9 = | 7 + 4 = 5 + 9 = 8 + 7 = |
3-
7 + 8 = 9 + 7 = 7 + 5 = | 9 + 8 = 7 + 6 = 11 4 = | 12 5 = 13 6 = 15 6 = | 14 6 = 11 6 = 7 + 8 = |
2. .
1) .
7 + 8 6 + 4 5 + 6 10 = 1
6 + 5 1 8 + 9 2 + 4 5 8 = 8
15 6 + 3 4 + 3 1 = 10
2) 5, 6:
11 13 19 12 14 20 15 16 18 18.
3) .
9 , 5 , . ? (9 + 5 = 14.)
|
|
4) .
3. .
?
? (.)
? (8.)
III. .
1. .
7, 8, 9.
2. : . 99, 4.
, , 12 7, .
: 12 7 5. 12 7, 5.
3. : . 99, 5.
1. , .
( 9 7. 9 7 2.
9 7, 2. , 9 7 = 2. 11 7. 11 7 4. 11 7, 4. , 11 7 = 4. . .)
2. : . 101, 12.
:
15 8. 15 8 7. 15 8, 7. , 15 8 = 7.
3. : . 101, 13.
, .
.
4. : . 103, 21, 22
5. 6 . 99 .
. .
? (13.)
? (7.)
? (5.)
? (13 7 = 3.)