1 (. 108)
236; 467; 2134; 2371; 2132; 1324.
2 (. 108)
| ? | ||
| 18 | 25 | |
| 15 | ? |
I.
1) 18 + 15 = 33 () ( ) ;
2) 33-25 = 8 () .
II.
1)25-18 = 7 () ;
2) 15-7 = 8 () .
4 (. 108)
, , . .
6 (. 109)
120 ;
?, 60 .
= 360 = 36 ;
S = 7200 2 = 72 2.
6. : 9, 10 (. 1), . 109
: .
: ; .
2.
:
I II
57: 19 100 72: 18 100
68: 17 80 96: 16 70
45: 15 90 75: 15 60
84: 6 200 52: 4 200
72: 12 + 9 91: 13 + 8
56: 14 + 8 80: 16 + 9
:
) 100 50 . 3 000 , 2 . ?
) 2 15 , 35 . .
4* (. 110).
1, 2, 4, 8, 16, 32, 64, 128, 256, 512
546, 541, 536, 531, 526, 521, 516, 511, 506
5 (. 110)
42 16: 8 > 42 8: 16;
234 (567 +8910) > 234567+ 8910;
666 25 = 222 75, 666 25 = (222 3) 25 = 222 (3 25) = 222 75;
111 45 = 111 (3 15) = (111 3) 15 = 333 15.
8 (. 111)
, 5638 = 5 638 .
, 5638 = 5 638 .
, 1/10 = 10 .
9 (. 111)
1 (. 110)
324; 807; 28; 136; 254; 940.
6 (. 111)
) 56 65 - (466 + 2175) = 999;
) 5867 + 10 794: 42 = 6124;
) 405 62 + (24 600 - 5607) = 44 103.
2 (. 110)
23-8 = 15 () .
I.
1) 28 15 = 420 () ;
2) 945 - 420 = 525 () ;
3) 525: 15 = 35 (/) .
II.
1) 945 : 15 = 63 (/) ;
2) 63 - 28 = 35 (/) .
3 (. 110)
1 = 10 000 2.
1) 200 000: 10 000= 20 () 1 2;
2) 525 100 = 52 500 (2) ;
3) 20 52 500 = 1 050 000 ().
7 (. 111)
, .
6. : 10, 11 (. 2, 3), . 111
|
|
|
: .
: ; .
2.
:
8 3 =...
567 =... ...
65 =... ...
100 =... ...
2600 =... ...
250 =... ...
50 =... ...
8 125 =... ...
5 (. 113)
:
) . 120 , 4 . .
) . 7 , 12. 120 , . ?
4 (. 112)
12 10 + 12 4 = 12 14
25 10 +25 7 < 25 70
17 6 10 = 17 60
41 10 + 41 9 < 41 90
6 (. 113)
. : 360 / = 21600 / = 21 600 / 360 / = 360 : 60 = 6 / . .
8 * (. 113)
I.
1) 15 -7 = 8 (.) ;
2) 8 - 4 = 4 (.) ;
3) 5 + 4 = 9 (.) .
II.
(15-7) + (5-4) = 9 ().
1 (. 112)
. : 123 73 = 8979. , :
20 075: 73 = 275;
22 995: 73 = 315;
7384: 52 = 142 . .
2 (. 112)
. ?
?
?
, . ?
1) 15 + 3 = 18 (/) ;
2) 180: 18 = 10 () ;
3) 15-3 = 12 (/) ;
4) 180: 12 = 15 () ;
5) 10 + 15 = 25 () .
: 360: 15 = 24 ().
3 (. 112)
45: 9 = 5 () ;
= 2 (9 + 5) = 28 ();
N ;
S = 25 (2); = 20 ().
7 (. 113)
9 (. 113)
1
1) 640:5=128 () ;
2) 640 128 = 512 () .
2
1284=512 ()
6. : 10, . 113
| 1. 42 6 12 4272 1 800 2 ¼ 200 1 2 1000 2 | 1. 6 56 11 56 66 1 100 2 1/5 400 80 2 800 2 |
| 2. : 603 = 96: 2 | 2. : 405 = 98: 2 |
| 3. : 76027 54243: 9 | 3. : 10001 49378: 7 |
| 4. 1 200 . 400 . . | 4. 1 800 . 700 . . |
| 5. 25 , 19. 3 60 , . ? | 5. 65 , 74 . 1 80 , . ? |
|
|
|
| 1. 42 6 12 4272 1 800 2 ¼ 200 1 2 1000 2 | 1. 6 56 11 56 66 1 100 2 1/5 400 80 2 800 2 |
| 2. : 603 = 96: 2 | 2. : 405 = 98: 2 |
| 3. : 76027 54243: 9 | 3. : 10001 49378: 7 |
| 4. 1 200 . 400 . . | 4. 1 800 . 700 . . |
| 5. 25 , 19 . 3 60 , . ? | 5. 65 , 74 . 1 80 , . ? |
:
: ; .
2.
:
I II
96: 2 40 98: 14 90
68: 17 80 72: 18 70
540: 18 7 640: 16 6
510: 17 9 520: 13 9
900: 18 3 800: 16 7
:
) 60 , 2 . .
) 1 000 . .
*) 14 : , . 10 , . ?
2 (. 114)
. .
) 2, 3, 1 4;
) 1, 2 3.
8 (. 115)
7* (. 115)
.
345 + 80 > 2150
= 10 ; = 0 .
: 13 - 540 < 300
= 7020 ; - 130 000 .
