3ab+3ac. 3ab−3ac. 5ab2+5ac. 5ab2−5ac2. 5a2b2−5a2c. [5]Ejercicio 3. 63. 280. 300. 98. 81. 1250. 105. 105. 315. 35. 105. 105. 0. 135. 120. 0. 1800. 540. 0. 270.