(4/9)2 = (42) / (92) = 16 / 81
(-3/7)3 = (-3)3 / (73) = -27 / 343
-1 1/5 = -6/5
(-6/5)2 = (-6)2 / 52 = 36 / 25
1 1/5 = 6/5
(6/5)3 = 63 / 53 = 216 / 125
Ответ: 3) а) 16/81; б) -27/343; в) 36/25; г) 216/125