Răspuns :
=[(-2/5 la puterea 9-5-2] la puterea 2 : (-2/5) la puterea 3 : 1/2 = (-2/5) la puterea 4 : (-2/5) la puterea 3 : 1/2 = -2/5 :1/2 = -2x2/5 = -4/5