(3 1/3+5 1/6)*2/5-2 3/4:(1 1/2-2/5)

Найдем знавчение выражения (3 1/3 + 5 1/6) * 2/5 - 2 3/4 : (1 1/2 - 2/5) по действиям: 1) 3 1/3 + 5 1/6 = 3 2/6 + 5 1/6 = 8 3/6 = 8 1/2; 2) 8 1/2 * 2/5 = (8 * 2 + 1)/2 * 2/5 = 17/2 * 2/5 = (17 * 2)/(2 * 5) = (17 * 1)/(1 * 5) = 17/5 = 3 2/5; 3) 1 1/2 - 2/5 = 1 5/10 - 4/10 = 1 1/10; 4) 2 3/4 : 1 1/10 = (2 * 4 +3)/4 : (1 * 10 + 1)/10 = 11/10 : 11/10 = 11/10 * 10/11 = (11* 10)/(10 * 11) = (1* 1)/(1 * 1) = 1; 4) 3 2/5 - 1 = 2 2/5. Значит (3 1/3 + 5 1/6) * 2/5 - 2 3/4 : (1 1/2 - 2/5) = 2 2/5. Ответ: 2 2/5.