А)
2/11 * (-5/3) : 7/8 = -2/11 * 5/3 * 8/7 = -80/231,
б)
-4/9 : 3/7 * (-5/12) = 4/9 * 7/3 * 5/12 = 35/81,
в)
13/14 : 3/10 : (-3/5) = -13/14 * 10/3 * 5/3 = -325/63 = -5 10/63,
г)
-4/17 * (-2/3) * (-17/4) = -4/17 * 2/3 * 17/4 = -2/3,
д)
6/35 * (-7/12) : 15/36 = -6/35 * 7/12 * 36/15 = -6/25,
е)
-1/17 : 17/30 * (-5/22) = 1/17 * 30/17 * 5/22 = 75/3179