a) [1996:2-455:7+(11x63x9-4x5x13)]:10+6x100=1291
[1996:2-455:7+(6237-260)]:10+6x100
(1996:2-455:7+5977):10+6x100
(998-65+5977):10+6x100
(933+5977):10+6x100
6910:10+6X10
691+6X100
691+600
1291
b) (0+123-123:3):[99x6-(5x100+46x2)]+395:5+262=
(0+123-41):[99x6-(500+92)]+395:5+262
(123-41):[99x6-592]+395:5+262
82:(99x6-592)+395:5+262
82:(594-592)+395:5+262
82:2+395:5+262
41+395:5+262
41+79+262
120+262
382