Помогите сделать!Очень сроочно 4 вариант

1. 7 + 1 5/9 * (-6 1/7) = -2 5/9 а) 1 5/9 * (-6 1/7) = 14/9 * (- 43/7) = -86/9 = -9 5/9 б) 7 - 9 5/9 = - 2 5/9 2. 4 5/7 / (-5 1/2) - 5 3/4 / 3 1/2 = - 2 1/2 а) 4 5/7 / (- 5 1/2) = 33/1 * (- 2/11) = - 6/7 б) - 5 3/4 / 3 1/2 = - 23/4 * 2/7 = -23/14 = -1 9/14 в) -6/7 - 1 9/14 = - 12/14 - 23/14 = - 35/14 = - 2 1/2 3. 3 2/3 * 5/13 + 3 1/13 / (-1 2/3) = 17/39 а) 3 2/3 * 5/13 = 11/3 * 5/13 = 55/39 = 1 16/39 б) 3 1/13 / (-1 2/3) = 40/13 * (- 3/5) = - 24/13 = -1 11/13 в) 1 16/39 - 1 11/13 = 55/39 - 24/13 = 55/39 - 72/39 = - 17/39 4. 8/9 - (4 2/7 - 3 1/7 / 1 1/2) = - 1 19/63 а) - 3 1/7 / 1 1/2 = - 22/7 * 2/3 = - 44/21 б) 4 2/7 - 44/21 = 90/21 - 44/21 = 46/21 = 2 4/21 в) 8/9 - 46/21 = 112/126 - 276/126 = - 164/126 = - 1 19/63 5. 2 1/15 * (9 - 13 2/15) + 13 2/15 * (2 1/15 - 9) = - 103 41/225 а) 9 - 13 2/15 = 8 15/15 - 13 2/15 = - 5 13/15 б) 2 1/15 - 9 = 2 1/15 - 8 15/15 = - 6 14/15 в) 2 1/15 * (- 5 13/15) = 31/15 * (- 88/15) = - 2728/225 г) 13 2/15 * (- 6 14/15) = 197/15 * (- 104/15) = - 20488/225 д) - 2728/225 - 20488/225 = - 23216/225 = - 103 41/225