, 21 2015 . 19:49
+
, !
!
:
1. =28
2. = 20
3. ( ) =41
4. ( ) =48
5. =20 ( (:3)+3 (3 . =5 )
6. =49
. . . . .
.
(- ):2= (49-20):2=14,5
-= 48 - 41 = 7 .
1 3 . , . 2 .
.
. 1 = 2*3
14,5*2= 29,. . 7*3=21
2 = 1 21 : 2 = 10 1 . 10 .
29 : 10 = 2,9. 2,9 , 9 3 1 2 .! !
3
: 2