Непонятно одно. 14*1 3/7+53/12:(4/9-23/12) помогитеееее!!!!!

14 * 1 3/7 + 5 3/12 : (4/9 - 2 3/12).

1) 14 * 1 3/7 = 14 * 10/7 = (14 * 10)/7 = 2 * 10 = 20;

2) 4/9 - 2 3/12 = 4/9 - 27/12 = (16 - 81)/36 = -65/36.

3) 5 3/12 : (-65/36) = 63/12 * (-36/65) = -(63 * 36)/(12 * 65) = -189/65 = -2 59/65.

4) 20 - 2 59/65 = 19 65/65 - 2 59/65 = 17 6/65.