42:11 × 3 and 2:1 × 1 and 5:1 =? 2 / 3 △ 5 / 18 × 3 / 8 =? Calculate each problem, can calculate simply want to calculate simply

42:11 × 3 and 2:1 × 1 and 5:1 =? 2 / 3 △ 5 / 18 × 3 / 8 =? Calculate each problem, can calculate simply want to calculate simply

Original formula = (11 / 42) × (7 / 2) × (6 / 5)
=(11×7×3)/(42×5)
=11/10
Original formula = (2 / 3) × 5 × (5 / 18) × (3 / 8)
=(2/3)×(1/5)×(18/5)×(3/8)
=(18/25)×(1/4)
=9/50