.
80 30 | 90 30 | |
70 20 | 65 20 | |
97 30 | 80 50 | |
60 40 | 70 20 |
.
97 30.
IV. .
1. 1.
.
(30 20) + 7 = 10 + 7 = 17
2. 2.
37 20.
37 20 = (30 + 7) 20 = (30 20) + 7 = 10 + 7 = 17
37? ( .)
20? ( .)
, ? (.)
3. 3.
.
75 30 = (75 + 5) 30 = (70 30) + 5 = 40 + 5 = 45
98 70 = (90 + 8) 70 = (90 70) + 8 = 20 + 8 = 28
94 40 = (90 + 4) 40 = (90 40) + 4 = 50 + 4 = 54
95 80 = (90 + 5) 80 = (90 80) + 5 = 10 + 5 = 15
4. 4.
.
? ( , 20.)
.
73 20 = 53 75 20 = 55 53 20 = 33 83 20 = 63
74 20 = 54 76 20 = 56 63 20 = 43 93 20 = 73
5? (7 . 2 . = 5 .)
?
3? ( 3 , 0 .)
= |
?
5. 5.
, .
77 60 = 17 39 10 = 29
, ? ( , .)
6. 6.
, 48 30.
:
48 .
30 .
? .
:
48 30 = 18 (.) .
: 18 .
7. .
: , , , , .
V. .
?
?
: , . 52, 7.
25
: 10; ; , ; .
I. .
II. .
|
|
1. :
5 + 2 + 3 6 + 5 1 3 + 5 1
9 2 6 + 8 7 + 8 6 + 4 + 2
50 + 20 + 30 60 + 50 10 30 + 50 10
90 20 60 + 80 70 + 80 60 + 40 + 20
2. 7 3 . .
3. :
19 . 5 , 4.
, , :
) ?
) , ?
) , ?
) ?
) ?
4. .
?