AYUDA POR FAVORRRRRR ES PARA MAÑANA
Calcula:
1) a + b - c - d =
2) -b + c - a -d =
3) (a – b) + (c – d) =
4) (-b + c) – (-d + a) =
5) (-b + d) . a =
6) (-c – d) . (-b) =
7) (-a) + (-b) + (c) =
8) (2a) – (-3b) =
9) (3a – 2b) – c =
10) (c – 2a) . (2d) =
11) (c + b) . (d + a) =
12) (a – b – c) . (-d) =