1. ( ) , 2. ( 30-50 ) 3. (10-20 ) 4. 5. 6. ( ) 10 ( 40 , – + 10 = + 5 ). , . , ( 2-3 ) , . : ( ), , . – , , . . . , , . – . 48 . , . . – , . , .
", ": 1 - 2 - 3 - ...... 8 - 9 - 10 -