1. .
:
2. 8 , 5. ?
3. . , ? ( , .)
4. ?
II. ( ).
1.
) 8 + 2 = 10 ) 7 + 7 = 14 ) 6 + 3 = 9 ) 5 + 6 = 11
8 + 4 = 12 7 + 5 = 12 6 + 5 = 11 5 + 4 = 9
8 + 6 = 14 7 + 2 = 9 6 + 7 = 13 5 + 8 = 13
8 + 8 = 16 7 + 4 = 11 6 + 4 = 10 5 + 15 = 20
8 + 9 = 17 7 + 9 = 16 6 + 9 = 15 5 + 7 = 12
8 + 7 = 15 7 + 3 = 10 6 + 6 = 12 5 + 9 = 14
8 + 5 = 13 7 + 8 = 15 6 + 8 = 14 5 + 5 = 10
8 + 3 = 11 7 + 6 = 13 6 + 2 = 8 5 + 3 = 8
2.
) 16 + 5 = 21 ) 13 + 3 = 16 ) 12 + 6 = 18 ) 15 + 9 = 24
16 + 7 = 23 13 + 5 = 18 12 + 10 = 22 15 + 5 = 20
16 + 10 = 26 13 + 9 = 22 12 + 9 = 21 15 + 7 = 22
16 + 9 = 25 13 + 4 = 17 12 + 3 = 15 15 + 10 = 25
16 + 8 = 24 13 + 8 = 21 12 + 7 = 19 15 + 2 = 17
16 + 12 = 28 13 + 6 = 19 12 + 5 = 17 15 + 8 = 23
16 + 6 = 22 13 + 7 = 20 12 + 11 = 23 15 + 6 = 21
16 + 11 = 27 13 + 10 = 23 12 + 8 = 20 15 + 3 = 18
3.
. , ?
) 16 . :
6 . 16 = 8 + 8
? . 8 6 = 2 (.)
) 20 . :
7 . 20 = 10 + 10
? . 10 7 = 3 (.)
) 18 . :
5 . 18 = 9 + 9
? . 9 5 = 4 (.)
) 24 . :
8 . 24 = 12 + 12
? . 12 8 = 4 (.)
4.
. 20. .
) 20 5 7 = 8 ) 20 4 3 6 = 7
) 20 8 2 3 = 7 ) 20 2 4 3 5 = 6
5.
.
) *7 + *6 = *? ) *5 + *9 =*?
: *7 + *6 = *3 : *5 + *9 = *4
) *7 *8 = *? ) *5 : *5
: *7 *8 = *9 *8 *8
*9*9
*? *2
6.
? > <.
: ) 5 + 8 < 8 + 6; ) 6 + 8 5 > 7 + 7 6;
) 15 7 > 15 9; ) 13 + 9 > 19 + 2.
36
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( / ): : ; : , , ; , ; , ; : , , .
I. . .
1. .
8 + 7 9 = 3 + 8 2 =
6 + 9 7 = 9 + 5 6 =
4 + 8 5 = 14 7 + 5 =
15 7 + 6 = 12 5 + 8 =
13 4 + 5 = 16 8 + 3 =
2. .
3. 10 . 2 ? .
II. .
. ?
.