Выполните действия (3/4+1/20)×1/2; (7/12-1/3)×16/19; (7 3/5-2 4/15)×9/32

(3/4 + 1/20) × 1/2 = (15/20 + 1/20) × 1/2 = 16/20 × 1/2= 16/40 = 4/10 = 0,4; (7/12 - 1/3) × 16/19 = (7/12 - 4/12) × 16/19 = 3/12 × 16/19 = 48/228 = 4/19 ; (7 3/5 - 2 4/15) × 9/32 = (7 9/15 - 2 4/15) × 9/32 = 5 5/15 × 9/32 = 5 1/3 × 9/32 = 16/3 × 9/32 = 144/96 = 3/2 = 1,5