\(3^3.18-3^3.12=3^3.2.3^2-3^3.2^2.3=3^5.2-3^4.2^2=3^4.2.\left(3-2\right)=3^4.2=162\\ \)
\(3^3.18-3^3.12=3^3.\left(18-12\right)=27.6=162\)
b) 9 . 22 . 13 + 87 . 39 = 198 . 13 + 87 . 3 . 13 = 198 . 13 + 261 . 13 = 13 . (198 + 261) = 13 . 459 = 5967
c) 4 . 52 - 81 : 32 = 4 . 25 - 81 : 9 = 100 - 9 = 91
d) 32 . 22 - 33 . 19 = 9 . 22 - 33 . 19 = 198 - 627 = - 429
e) 24 . 5 - [ 131 - (13 - 4)2 ] = 120 - (131 - 92) = 120 - (131 - 81) = 120 - 50 = 70
g) 100 . { 250 : [ 450 - (4 . 53 - 22 . 25) ] } = 100 . { 250 : [ 450 - (4 . 125 - 4 .25) ] }
= 100 . [ 250 : (450 - 400) ]
= 100 . (250 : 50)
= 100 . 5
= 500