a)[(-2)^3]^4:(-4)^5+81:(-3)^3-2•(-3)^2=
(-2)^12:[(-2)^2]^5+3^4:(-3)^3-2•(-3)^2=
(-2)^12:(-2)^10-3^1+18=
2^2-3+18=
1+18=
19
b)125:(-5)^2+(-1)^4•(-24):(-2^3)-144:3^2=
5^3:5^2+1•(-24):(-8)-144:9=
5^1+3-16=
8-16=
-8
