Efectueaza c)104×6:3+283=

c)104×6:3+283=491
872:4×3-648=6
981:9-744:8=109-93=16
e)26×9-138:6×5=234-115=119
920:4×3-609:3=690-203=487
(530-214)×2-409=316×2-409=223