() , , ; , ; .
.
1. .
5, 8, 20, 23, 37, 40 45.
2. :
) 37, 30, 7, 14, 28, 55 36;
) 12 6, 66;
) 90 15, .
3. "" (. 20).
. 20
IV. . 54 4. "". "" , 䳿. : 6 4, 3, 2. "" , - , :
320 + 40 :4 -20 | 300 + 200 2 -400 | 640- 120 + 80 : 3 | 240 + 320 :8 :5 |
: "320 40, 4, 20".
:
(320 + 40): 4 - 20; (300 + 200) 2 - 400.
5. . , . . ³ .
9
(. 9):
) II ;
) III ;
) IV ; : ) III 7.
, . ( ), . : "³ 1 7, 1 < 7".
6. . ' 12 䳿.
55
7. . .
1. , 9,17,20,31.
25-0 81 +9 18-9 40-25
17-9 16 + 4 42 + 6 35-34
29-3 16-8 12 + 5 66 + 6
2. , 25.:
40-13 51-31 25 + 3 44-2
13+13 32-16 43-7 60-3
28-20 16 + 9 14-7 25 + 0
3. , .
3 + 8 (13- 8)+ 4 43-(25+ 4)42: 6
93-6 48 + (16 - 9)(55 + 24) - 83 8
4. ' , .
34- = 7 16: = 8 -7=17 :4=16 -3 = 9 36: = 4
5. .
65 + = 68 49 - 7 = 42 70 - 7 = 63 30 + 7 = 100
37 + 3= 40 67-40=27 86 + 3 = 83 24 + 6 = 20
67-20=65 80-4 = 86 88-7 = 81 60-5 = 55
, 67 20.