Răspuns:
Explicație pas cu pas:
38 : 2 = ( 20 + 18 ) : 2 = (20 : 2) + (18 : 2) = 10 + 9 = 19
45 : 3 = (30 + 15 ) : 3 = (30 : 3) + (15 : 3 ) = 10 + 5 = 15
56 : 4 = ( 40 + 16 ) : 4 = (40 : 4 ) + ( 16 : 4 ) = 10 + 4 = 14
78 : 6 = ( 60 + 18 ) : 6 = ( 60 : 6 ) + ( 18 : 6 ) = 10 + 3 = 13
84 : 7 = (70 + 14 ) : 7 = ( 70 : 7 ) + ( 14 : 7 ) = 10 + 2 = 12