1. A = 2/3 - 2/3 X 9/5 = 2/3 - 18/15 = (10-18)/15 = -8/15
B = (1/6 - 1/3) : (2/5 x 3/4) = (1-2)/6 : 3/10 = -1/6 x 10/3 = -5/9
2. A - B = -8/15 - (-5/9) = -8/15 + 5/9 = 1/45
A X B = ( -8/15) x (-5/9) = 8/27
A/B = (-8/15) / ( -5/9) = -8/15 x (-9/5) = 24/25