Rezolvă, după model:
24:6) + (30 : 6) = (24 +30) : 6 = 54 : 6 = 9
(25:5) + (15:5) =
b) (42 : 7) + (14 : 7) =
(40:8) + (32: 8) =
(16:4) + (24:4) =