Răspuns:
Explicație pas cu pas:
75 : 5 = (50+25) : 5 = 50 : 5 + 25 : 5 = 10 + 5 = 15
a) 64 : 4 = (40+24) : 4 = 40 : 4 + 24 : 4 = 10 + 6 = 16
b) 91 : 7 = (70+21) : 7 = 70 : 7 + 21 : 7 = 10 + 3 = 13
c) 54 : 6 = (30+24) : 6 = 30 : 6 + 24 : 6 = 5 + 4 = 9
d) 78 : 2 = (60+18) : 2 = 60 : 2 + 18 : 2 = 30 + 9 = 39
e) 51 : 3 = (30+21) : 3 = 30 : 3 + 21 : 3 = 10 + 7 = 17