3. .
7, 5, 3.
3. -, .
7. :
) 17 20, (18, 19), ; ) b= 11, 12, 13, 14.
.
.
1, 2,4* (6 ).
, .
| I II | 4 / 1 3 / | ? | 14 | |||
? 4 + 3 = 7 (/)
, 1 7 . , 14 ?
14: 7 = 2 ()
14 2 , , 2 .
4*.
□:8 =(. 7)
□: 9 = (. 6)
, . , 1.
□: 8 = 1 (. 7), 15 (8 1 + 7 = 15). . 15:9 = 1 (. 6)
9∙1 + 6 = 15. .
: 15.
.
6.
.
.
8, 9.
100. . . .(. 68-69)
: 1) ;
2) .
3) .
1. .
2. .
3. .
|
|
| 72: 4 = 18 18: 3 = 6 6:2 = 3 |
() 7*.
.
.
3, 4, 5, 6 (1 , 2 ).
, .
I.
1) 65∙4 = 260 ()
2) 560 - 260 = 300 ()
3) 300: 4 = 75 (/)
II.
4) 560:4 = 140 (/) .
5) 140-65 = 75 (/)
4.
5.
= 2 4 = 8 ()
2 , :
= (2 2) 4 = 16 ().
, 2 .
.
6. , () .
.
.
|
|
|
8, 9.
101. . .
(. 70 -71)
: 1) ;
2) .
3) .
1. .
2. .
3. .
7, 3, 6*.
3. : 253, 263.
6*. , , . ( .) , ? ( .)
. ( .) , ? ( .) . ( .)
, . ( . . , .)
, . ( . . , .)
7. (156 3) 2 = (156 2) 3 , . 156 6 .
6 (3 58) < 58 (3 6) .
6 (3 58) = 58-(3 6) - .
(115 2) 3 = 115 (2 + 3) . 115 6 , 115 5 . (115 2)-3> 115-(2 + 3).
