A = -4/9 + 5/6 - 5/18

To add these fractions, we need to find a common denominator. The least common multiple of 9, 6, and 18 is 18.

A = -8/18 + 15/18 - 5/18
A = (15 - 8 - 5) / 18
A = 2/18
A = 1/9

Therefore, A = 1/9

B = 4/9 × 8/15 + 4/9 × 7/15 - 4/9

To multiply these fractions, we simply multiply the numerators together and the denominators together.

B = (4 × 8) / (9 × 15) + (4 × 7) / (9 × 15) - 4/9
B = 32/135 + 28/135 - 4/9
B = (32 + 28 - 60) / 135
B = 0/135
B = 0

Therefore, B = 0