( 5 2\9 Помножить 3 1\8 + 3 1\3 ) помножить

(5 2/9 * 3 1/8 + 3 1/3) * 3 - 7 2/3 * 1,4 = 48 9/40.

1) 5 2/9 * 3 1/8 = (5 * 9 + 2)/9 * (3 * 8 + 1)/8 = (45 + 2)/9 * (24 + 1)/8 = 47/9 * 25/8 = 1175/72 = 16 23/72;

2) 16 23/72 + 3 1/3 = 16 + 3 + 23/72 + 1/3 = 19 + 23/72 + 24/72 = 19 + (23 + 24)/72 = 19 + 47/72 = 19 47/72;

3) 19 47/72 * 3 = 1415/72 * 3 = (1415 * 3)/(3 * 24) = 1415/24 = 58 23/24;

4) 7 2/3 * 1,4 = (7 * 3 + 2)/3 * 14/10 = (21 + 2)/3 * 14/10 = 23/3 * 14/10 = 322/30 = 10 22/30 = 10 11/15;

5)58 23/24 - 10 11/15 = 58 - 10 + 23/24 - 11/15 = 48 + (23 * 5)/120 - (11 * 8)/120 = 48 + (115 - 88)/120 = 48 27/120 = 48 9/40.