Лидия9 лет назад
(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