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III. .

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.)



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