Efectuează:
128 + 54 : 6=
(199 + 1) 3 x 7 =
100 (8 x 8: 8) =
2 x 8+56:7 =
7 x (46-38) =
45 +20:4 3 x 5 =
(10+13)+(36:9-21:7)=
(5 x 4)+(45-2x9x6x0)=.
