.
1,2, 7, 4, 3, 5*
:
+2 = 5.
, ? (3.) ? (5 3.) () : + 2 = 5. . : 2 5. . , . , 2, 5. ? ? ( : = 5 - 2, = 3.) : 3 + 2 = 5, 5 = 5.
. 
, 1 .
1. . .
|
2.
3 . 7 .
2 . 8 .?
.
3.
. 12
. ?, 4
?
, 4 ? ( 4.) ?
12:4 = 3 ()
.
4.
1 + 9 < 20 ; 17 + 9 < 20 ;
4 + 9 < 20 ; 19 + 9 < 20 .
16 + 9 < 20 . : 1, 4.
.
5*.
? (27 .) ? ( .) . ? ( .) ? ( 2 .) ? ( , , .) , , ? (2 .) , 27 ? (3 .) , ?
27: 3 = 9 (.)
?
92 = 18 (.)
, 3 3 , . 4 , 18 .
53+31 = 18 (.)
.
9, 10, .41.
:
: 1) , , , ;
2) ;
3) , .
.
.
3. .
4, 8.()
.
.
|
|
|
1,5, 7, 3, 2, 6*.
3.
. 20 .?
. ?, 2 .
I.
20 + 20: 2 = 30 (.)
II.
 |
5. 4-9 + 17 = 36 + 17 = 53;
20 + 20:4 = 20 + 5 = 25.
6*. : 10, 0, 0. 10 . 7 , ; 3 . . (10, 0, 0) (3, 7, 0) (3, 4, 3) (6, 4, 0)(6, 1, 3)(9, 1, 0)(9, 0, 1)-(2, 7, 1) (2, 5, 3)
