a. 127 : 67 = 27
b. 275 : 813 = (33)5 : (34)3 = 315 : 312 = 33
c. 183 : 93 = 23
d. 1253 : 254 = (53)3 : (52)4 = 59 : 58 = 5
\(12^7:6^7=\left(12-6\right)^7=6^7\)
\(27^5:81^3=\left(3^3\right)^5:\left(3^4\right)^3=3^{15}:3^{12}=3^3=27\)
\(18^3:9^3=\left(18-9\right)^3=9^3\)
\(125^3:25^4=\left(5^3\right)^3:\left(5^2\right)^4=5^9:5^8=5^1=5\)