Помогите решить 805 пожалуйста

 = 5/2*(2/15 - 21/6) - 11/4 = - 11 1/6 1) 2/15 - 21/6 = 4/30 - 105/30 = - 101/30 2) 5/2 * (-101/30) = - 101/12 3) - 101/12 - 11/4 = - 101/12 - 33/12 = - 134/12 = - 11 2/12 = - 11 1/6 ----------------------------------------------------   = - 8/7*(4/5 + 19/20) * (41/6 + 14/3) = - 8 1/20 1) 4/5 + 19/20 = 16/20 + 19/20 = 35/20  2) 41/6 + 14/3 = 41/6 + 28/6 = 69/6 = 23/2 3) - 8/7 * 35/20 * 23/2 = - 161/20 = - 8 1/20 ------------------------------------------- = (51/8 - 11/4)*(- 4) +7/18 - 9 = - 23 1/9 1) 51/8 - 11/4 = 51/8 - 22/8 = 29/8 2) 29/8 * (- 4) = - 29/2 3) - 29/2 + 7/18 = - 261/18 + 7/18 = - 254/18 = - 14 2/18 = - 14 1/9 4) - 14 1/9 - 9 = - 23 1/9 -------------------------------------------- = 55/6 : (4 1/3 - 8) + 24 * 3/8 = - 6 1/2 1) 4 1/3 - 8 = - 3 2/3 = - 11/3 2) 55/6 : (- 11/3) = - 5/2 = - 2 1/2 3) 24 * 3/8 = 9 4) - 2 1/2 + 9 = - 6 1/2