Найдите значение выражения : 1)3/5*4/9+1 1/3; 2)1 1/4*2/5-1/3

1) 3/5 * 4/9 + 1 1/3 = (3 * 4)/(5 * 9) + (3 * 1 + 1)/3 = 4/(5 * 3) + 4/3 = 4/15 + 5 * 4/(3 * 5) = (4 + 20)/15 = 24/15 = 8/5;

Ответ: 8/5.

2) 1 1/4 * 2/5 - 1/3 = (1 * 4 + 1)/4 * 2/5 - 1/3 = 5/4 * 2/5 - 1/3 = 2/4 - 1/3 = 3 * 2/12 - 4/12 = (6 - 4)/12 = 2/12 = 1/6;

Ответ: 1/6.