5.Efectuează: a) 49 * 5+ 38 x 7 53 x 6 + 82 x 9 b) 66 x 6 + 48 x 7 58 x 9 + 31 x 9 c) 83 x 8 + 52 x 5 17 x 3 + 29 x 8​

5Efectuează A 49 5 38 X 7 53 X 6 82 X 9 B 66 X 6 48 X 7 58 X 9 31 X 9 C 83 X 8 52 X 5 17 X 3 29 X 8 class=