1 (. 28)
: .
2 (. 28) -
, , D ;
, , D ;
, , D, , ;
, .
4 (. 29)
| 24 030 |
6 (. 28)
(80-20): 3 = 20 ()
7 (. 29)
100 = 800
7. : 9, 10, . 29
:
: ; .
2.
2 (. 31)
4 (. 31)
.
: 5 < 20; 5 = 20; = 4.
, 4: = 0, 1, 2, 3 ().
1 600 . 80 5 . ?
120 . 50 . . ?
3 900 2 000 . ?
2 12 /. 2 , . ?
9 12 8 .
5* (. 31)
, :
1+3+5+7+9=25
2 + 4 + 6 + 8 = 20
25-20 = 5
-. 1 . 4. . 9. 5. (9 - 4 = 5.)
1 (. 31)
.
. ___________________4___
. __________________ 26
? ( .) ? (26.)
? (4.) ? ( 4 4.) ? ( 4 (26 + 4) 4 (26-4).
.
I.
1) 26 + 4 = 30 (.) ;
|
|
|
2) 30: 2 = 15 (.) ;
3) 15 - 4 = 11 (.)
26 - 15 = 11 (.) .
II.
1) 26 4 = 22 (.) ;
2) 22: 2 = 11 (.) ;
3) 11 + 4 = 15 (.)
26 - 11 = 15 (.) .
3 (. 31)
7 (. 31)
6 (. 31)
. , F, , N , .
7. : 8, 9, . 31
:
: ; .
2.
, :
1506 = 900
1307 = 910
1404 = 560
1704 = 780
1403 = 420
1205 = 600
1207 = 740
1504 = 700
1305 = 750
1308=1 040
1206 = 640
1406 = 740
4 (. 32)
) 53 761, 89 623;
) 6401, 2342.
5 (. 33)
+ 9< 12 (1, 2);
+ 5< 17(1,..., 11);
5 + 3 < (9, 10, 11, 12, 13, 14...).
7 (. 33)
: 2, 3.
6* (. 33)
) 4, 5, 8, 9, 12, 13, 16, 17
) 4, 5, 8, 9, 12, 13, 16, 17
) 4, 5, 8, 9, 12, 13, 16, 17
:
) 36 . 1/4 . ?
) 400 . , 10 . ?
) 9 30 6 45 . 1 50 . ?
