1.( ((25 * 3) / 6) / (5/3) ) - (7 * 4)/4 = (25 * 3) / ( 2 * 5) - 7 = 15/2 - 7 = 7 1/2 - 7 = 1/2
2. ( (31/9) - (23/12) ) * (42/11) + (6 * 25) / 12 - 7/3 = ((124 - 69)/36) * 42/11 + 25/2 - 7/3 = ( (55 * 42) / (36 * 11) ) + (75 - 14) / 6 = 35/6 + 61/6 = 96/6 = 16