1. .
2. 15.
20 5 12 + 3 13 + 3 9 + 6
8 + 7 16 1 11 + 4 19 4
16 2 10 + 6 10 + 5 18 3
II. .
.
9.
1.
.
6 . 10. ? (6 + 10 = 16.)
18 . 10. ? (18 10 = 8.)
23 . 10. ? (23 + + 10 = 33.)
44 . 10 . ? (44 10 = = 34.)
2.
? , ? (.)
.
3.
? , :
: 14 10 + 4. 9 1 . 9 9 . 1 + 4.
: 5.
4 ( , + 9, 9).
5.
, 10 9.
6. ? ? .
12 . :
6 . 1) 12 6 = 6 (.) .
9 . 2) 9 + 6 = 15 (.) .
? .
7. .
:
1) 56 20 = 36 (.) .
2) 56 + 36 = 92 (.) .
8 ( ).
) 15 8 = 7 ) 12 8 = 4 ) 18 2 = 16
15 9 = 6 12 9 = 3 18 9 = 9
15 7 = 8 12 4 = 8 18 7 = 11
15 6 = 9 12 7 = 5 18 3 = 15
15 3 = 12 12 6 = 6 18 8 = 10
15 5 = 10 12 3 = 9 18 5 = 13
12 5 = 7 18 6 = 12
18 4 = 14
9.
?
10.
?
5 + 9 = 7 + 4 = 2 + 9 =
5 + 9 = 4 7 + 9 = 6 2 + 9 = 1
. , .
: 36 + 9 = 44 : 87 + 9 = 96
24 + 9 = 32
? ( 1.)
.
5 9 = 7 9 = 2 9 =
5 9 = 6 7 9 = 8 2 9 = 3
III. .
.
.
9 + 2 = 9 + (1 + 1) = (9 + 1) + 1 = 10 + 1 = 11
9 + 3 = 9 + (1 + __) =
9 + 4 = 9 + (1 + __) =
9 + 5 = 9 + (1 + __) =
9 + 6 =
9 + 7 =
9 + 8 =
9 + 9 =
.
9 . ?
IV. .
9, 1 ?
23
11, 13
: - = 11,
|
|
= 13, , .
.
: 20, , , , ; , .
: ; .
( / ): : ; ; : , ; , , ; : ; , , .