Помогите фото ниже.. 6класс.Очень нужно помогите!!! Тему не понял.

4) = 4 1/3 *(1 5/6 - 3 5/6)= 4 1/3 *(-2) = 8 2/35) = 4 1/5 *(5 7/9 - 3 5/9 - 1 2/9) = 4 1/5 * 1 = 4 1/5===================3) a) = 3 6/9 + 1/9= 3 7/9б) = 2 7/7 - 1 1/7 = 1 6/7в) = -5 * 33/10 = -33/2 = -16 1/2г) = 8/3 *(-1/4)= -2/3д) = -3 3/6 + 2 5/6 = -4/6 = -2/3е) = -4ж) = 6/5 *(-5/12) = -1/2з) = -28/9 *(-6/7) = 56/21 = 2 14/21 = 2 2/3и) = 0---------------------------4) = 5 1/4 *(1 9/10 - 4 9/10)= 5 1/4 * (-3) = -15 3/4--------------5) = 5 1/3 *(4 2/5 - 2 1/5 - 1 1/5 )= 5 1/3 * 1= 5 1/3