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Folositi parantezele pentru a obtine 15
7×2-8:2+5+1×2
Daca raspudeti dau 30 puncte


Răspuns :

( 7 × 2 - 8 ) : 2 + ( 5 + 1 ) × 2 = ( 14 - 8 ) : 2 + 6 × 2 = 6 : 2 + 12 = 3 + 12 = 15 
(7 × 2 - 8 ) : 2 + ( 5 + 1 ) × 2 =

= ( 14 - 8 ) : 2 + 6 × 2 =

= 6 : 2 + 6 × 2

= 3 + 12

= 15