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Знайди значення виразу: 1. (61/7 – 53/4) : 11/14 + (33/4 – 15/6) : 1/6 = 12. 1) 61/7 – 53/4 = 58/7 – 53/4 = (32 - 21)/28 = 11/28; 2) 33/4 – 15/6 = 27/4 – 15/6 = 1(21 - 10)/12 = 111/12; 3) 11/28 : 11/14 = (11 ∙ 14)/(28 ∙ 11) = 1/2. 4) 111/12 : 1/6 = (23 ∙ 6)/(12 ∙ 1) = 23/2; 5) 1/2 + 23/2 = 24/2 = 12. 2. 54/19 · 34/7 + 1(15 )/19 : 7/25 – 12/3 = 231/3. 1) 54/19 · 34/7 = (99 ∙ 25)/(19 ∙ 7) = 2475/133 = 1881/133; 2) 115/19 : 7/25 = 34/19 : 7/25 = (34 ∙ 25)/(19 ∙ 7) = 850/133 = 652/133; 3) 1881/133 + 652/133 = 24133/133 = 25; 4) 25 – 12/3 = 243/3 – 12/3 = 231/3.