1 (. 40)
.
12: (3 2) = (12: 3): 2 = (12: 2): 3 = 2;
64: 16 = 64: (2 8) = (64: 2): 8 = (64: 8): 2 = 4 . .
3 (. 40) -
.
2 (. 40)
.
| 9 | ?? ? | 360 |
| 9 | ? | 1/10 |
I.
1) 360:9 = 40 (.);
2) 360: 10 = 36 ();
3) 36:9 = 4 (.);
4) 40 + 4 = 44 (.).
II. 10 , . 10 :
360:9 = 40 (.); 40: 10 = 4 (.);
40 + 4 = 44 (.).
4 (. 40)
1) 18 2 = 9 () ;
2) 9 - 3 = 6 () ;
3) 6 - 4 = 2 () .
7 (. 41)
.
34: 7 = 4 (. 6);
6<7;
4 7 + 6 = 28 + 6 = 34 . .
5 (. 40)
7. : 10, 11, . 41
:
: , ; .
2.
:
390 800;
270 9;
24 ;
900.
, :
560:70
6110
3200:80
12300
11 (. 43)
4500:500
100-60:15
5090-70
1000-500:10
3 (. 42)
3, 6.
8 (. 43)
:
4 (. 42)
1/200 1000.
1000: 200 = 5 ()
) 4 36 . 100 ?
) 50 . 2/5 , . ?
) , . .
6* (. 42)
, . (0,0,0).
5 3
0 0 0
| 500 500 | ||
, , : , . .
|
|
|
1 (. 42)
: 8000: 8 = 8 .: 8 = 1 . = 1000;
4200: 7 = 42 .: 7 = 6 . = 600 . .
2 (. 42)
: I _________________ 320
II _____
I 320
II ?, 4
III -?
1) 320 4 = 80 () II ( );
2) 320 + 80 = 400 () I II ( ) 80 5 = 400 () .
5 (. 43)
= 2300; k = 11 600.
7 (. 43)
, . , .
) = 12 ; 12:2 = 6 () ; : 1 5 ; 2 4 ; 3 3 . .
) = 16 ; 16:4 = 4 (). 4 .
10 (. 43)
1 50 . .
1) 75 - 50 = 25 (/) ;
2) 50 : 25 = 2 () .
:
: ; .
2.
, :
...: 4 = 8 (....)
...: 9 = 30 (....)
...: 5 = 3 (....)
:
) 80 . .
) 20 , 4 . .
) 60 2, 6 2. .
7 (. 45)
218; 210 < 218 < 220.
5 (. 45)
______?
________________________
16 + 16 4 = 80 16 5 = 80
4* (. 45)
34 ; (37 - 3 = 34). .
______
________________
34: 2 = 17 () ;
17 + 34 = 51 () .
8 (. 45)
1) 60 : 6 = 10 () - ;
2) 45 + 10 = 55 () .
6* (. 45)
.
1/3<2/3, 1/6<3/6
