a) $A = 1500-{52.23-11.[72-5.23+8.(112-121)]} $
$ = 1500- {1196-11.[72-115+8.(-9)]} $
$ = 1500-{1196-11.[72-115-72]} $
$ = 1500-{1196-11.(-115) } $
$ = 1500- (1196+1265)$
$ = 1500-2461 = -961$
b) $B = 32.103 - [132-(52.4+22.15)].103$
$ = 32.103- (-406).103$
$= 3296+41818$
$ =45114$
c) $E = (-10).(-7)+(-15).5-(-3)^3 $
$ = 70-75+27$
$ = 22$