. .
, , . : (7 = 2 + 5); (235 = 200 + + 5); 䳿 278
ղ.
(4 + 4 + 4-4-3); (7 + 8 = 7 + + (3 + 5) = 10 + 5 = 15); ((20 - 3> 4 = 20 4 - 3 ■ 4).
. .
. " ". : 4 3 + 4 6 = 4 (3 + 6).
"", "" "" , , .
, (, ; , 50; , ">", .).
. , 7 + 3 3 + 7, , . , , 7 + 3 = 3 + 7, .
. : 9*9-3. 9, 9 3. , , 9. 9 > 9 - 3.
10 + 3*10 + 5. 10.
3, 5. , . , 10 + 3 < 10 + 5.
5 + 5 + 5 + 5*5-3. 5 4 , 3 . , , , 5 + 5 + 5 + 5>5-3.
(, , : 31 - 10 - 3 = 24; 4-7-4:2 = 20).
ϳ . ϳ . , , , '.
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ϳ "". , "" , " ".
. 3 . 2 "", .
+ | ||
+ | ||
+ | ||
+ |
䳿 () ( 5). , .
? ? : 8 + .
: , . ? ?
, - , , . : 8 + . : 8 8 . , . , = 1, 8 + = 9; = 2, 8 + = 10.
8 + , = 3, = 4.
, '. 4, = 12, = 8, = 1. :
- = 12 12-4 = 8 '
=8 8-4=4
= 7 7-4=3
. :
+3 |
. , .
, : + 8; 46 - ; 3 ; 24: ; 3 + 17, = 3 (4, 6, 8).
3 ; , ; . :
1. , - 12.
+ { + 25) { + ): 4 : 4 +
2. , = 37', 44; = 85, = 12. 280
XIII.
4 , . : + , 338, = 507. : ;
+ . =338, 6 = 507. 338 + = 845.
+507 845
, , . : , ' 10. , = 200, = 180. ' :
-: 10. =200, = 180. 200- 180: 10= 182.
-: 10= 182.
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