II. .
1. 7 70, 7, 20 40, 5, . ., 36, 27, 56, 63.
4 9 = 36 3 9 = 27 7 8 = 56 7 9 = 63
9 4 = 36 9 3 = 27 8 7 = 56 9 7 = 63
6 6 = 36
2. . , , .
1: 4 , 2 . . (8 .)
2: 16 , 4 . ? (20 .)
3: 36 , 3 . ? (12 .)
III. .
:
(30 + 6): 3
(80 + 4): 4
(40 + 8): 2
. , .
(30 + 6): 3 = 30: 3 + 6: 3 = 10 + 2 = 12.
.
: 46: 2 93: 3.
: 1) ; 2) , , , .
.
46 40 6. 2 .
46: 2 = (40 + 6): 2 = 40: 2 + 6: 2 = 20 + 3 = 23.
, , , .
:
42: 3 75: 5 70: 5 78: 6
, , , .
. , , . ?
, , - .
, , . , , 3 , 10, 12 , 4. 14. 10 + 4 = 14.
. 42 30 12 3; 30 3 10, 12 3 4; 10 + 4 = 14.
|
|
, 70: 5, 50 + 20.
:
? ?
. , .
, . 13 .
1 2.
1:
72: 4 = (40 + 32): 4 = 40: 4 + 32: 4 = 10 + 8 = 18
72: 3 = (60 + 12): 3 = 60: 3 + 12: 3 = 20 + 4 = 24
72: 6 = (60 + 12): 6 = 60: 6 + 12: 6 = 10 + 2 = 12
.
2:
, .
IV. .
.
3 ( ) .
. , . 3 6, 18. , , . :
18 3 = 15.
:
3 6 3 = 15 (.)
: 15 .
4 , , .
2. 5 6.