А) (6 1/24-2/3):(3 1/2+1 7/8) б)2 2/9*3,7-2 2/9*(-5,3)

а) (6 1/24 - 2/3) / (3 1/2 + 1 7/8) = 

1) 6 1/24 - 2/3 = 145/24 - 2/3 = 145/24 - 16/24 = (145 - 16)/24 = 129/24 = 5 9/24 = 5 3/8;

2) 3 1/2 + 1 7/8 = 7/2 + 15/8 = 28/8 + 15/8 = (28 + 15)/8 = 33/8 = 4 1/8;

3) 5 3/8 / 4 1/8 = 43/8 / 33/8 = 43/8 * 8/33 = 43 * 8/8 * 33 = 43/33 = 1 10/33;

б) 2 2/9 * 3,7 - 2 2/9 * (-5,3) = 2 2/9 * 3 7/10 - 2 2/9 * (-5 3/10) = -12;

1) 2 2/9 * 3 7/10 = 20/9 * 37/10 = 20 * 37/9 * 10 = 2 * 37/9 = 74/9 = 8 2/9;

2) 2 2/9 * (-5 3/10)= 20/9 * (-53/10) = 20 * (-53)/9 * 10 = 2 * (-53)/9 = -108/9 = -12;