a) 32:16+{76-2•[(20+4•5):5]-2•6}=
=2+{76-2•[(20+20):5]-12}=
=2+[76-2•(40:5)-12]=
=2+(76+2•8-12)=
=2+(76+16-12)=
=2+(92-12)=
=2+80=
=82
b) (3+6+9+12+15+18):(1+2+3+4+5+6)=
=63:21=
=3
c) 3+10•{3+10•[3+10•(3+10•3)-3]-3}-3=
=3+10•{3+10•[3+10•(3+30)-3]-3}-3=
=3+10•[3+10•(3+10•33-3)-3]-3=
=3+10•[3+10•(3+330-3)-3]-3=
=3+10•[3+10•(333-3)-3]-3=
=3+10•(3+10•330-3)-3=
=3+10•(3+3300-3)-3=
=3+10•(3303-3)-3=
=3+10•3300-3=
=3+33.000-3=
=33.003-3=
=33.000
