1. Given a + B = - 2, ab = 3, what is 2 [AB + (- 3a)] - 3 [2B AB] equal to? There are two more questions as follows: 1. It is known that the m-th power of - 3a, the second power of BC and the third power of 6a, the n-th power of B are of the same kind, and the value of the second power n - [the second power of 2mn-3 (- the second power of M, N + the second power of Mn)] of formula 3M is obtained

1. Given a + B = - 2, ab = 3, what is 2 [AB + (- 3a)] - 3 [2B AB] equal to? There are two more questions as follows: 1. It is known that the m-th power of - 3a, the second power of BC and the third power of 6a, the n-th power of B are of the same kind, and the value of the second power n - [the second power of 2mn-3 (- the second power of M, N + the second power of Mn)] of formula 3M is obtained

1. Given a + B = - 2, ab = 3, then 2 [AB + (- 3a)] - 3 [2B AB] is equal to 2 [AB + (- 3a)] - 3 [2B AB] = 2ab-6a-6b + 3AB = 5ab-6 (a + b) = 15 + 12 = 271