f) (3/10 + 2/3) / (5/10 - 2/10) = (9/30 - 20/30) / (3/10) = -(11/30) / (3/10) = -(11/30) / (9/30) = -(11/9)
g) (-7 - 4 * (-2)) / (10-5) = 1/5
h) [(-8) / (-9)] * (-3) = 8/9 * (-3) = -(24/9) = -(2 i 2/3)