.

(7) (100) 2
(15) (5)

:
() ()
() ...

.

() 7 () 12 ... .


() . () 7 12 .


()


6 + = 20
6 6
()

6 + = 20
6 + () = 20
= 14

:
( + 4) = 3 .


( + 4) = 3

( + 4)
( + 4) 2 = (3) 2 + 4 2

= 3 2 + 4 2

= 7 2

( + 4)
( + 4) = () + 4
= 3 + 4
= 7

( + 4) ( )
( + 4) = () + 4
= 3 + 4
= 7