Вычислите (4 2/3:3,5 + 3,5 :4 2/3) • 4,8

(4 2/3 : 3,5 + 3,5 : 4 2/3) * 4,8 = 10. 

1). 4 2/3 : 3,5 = 4 2/3 : 3 5/10 = 14/3 : 35/10 = 14/3 * 10/35 = (14 * 10) / (3 * 35) = 140/105 = 28/21 = 4/3 = 1 1/3;

2). 3,5 : 4 2/3 = 3 5/10 : 4 2/3 = 35/10 : 14/3 = 35/10 * 3/14 = (35 * 3) / (10 * 14) = 105/140 = 21/28 = 3/4; 

3). 1 1/3 + 3/4 = 4/3 + 3/4 = (4 * 4) / (3 * 4) + (3 * 3) / (4 * 3) = 16/12 + 9/12 = (16 + 9) / 12 = 25/12 = 2 1/12; 

4). 2 1/12 * 4,8 = 2 1/12 * 4 8/10 = 25/12 * 48/10 = (25 * 48) / (12 * 10) = 1200 / 120 = 10.