38. Completen el cuadro
a | b |. a • b | -a • (-b) | (-a) • (-b) |
3 | -4| ----- | -------- | --------- |
-- | 7 | ----- | 35 | --------- |
-- | -6| ----- | ------ | 24 |
![38 Completen el cuadro a b a b a b a b 3 4 7 35 6 24 class=](https://es-static.z-dn.net/files/d19/1f919ebf7cc9d9019777bded8664164c.jpg)