a ) 14 - [23-( 39-52)+18] = 14 - [ 23 - (-13)+18]= 14 -(23+13+18)= 14- 54= - 40
b) 96+(-103) -{ 86 -[5 -(17-48)]} = 96-103-[ 86- (5+31)]= -7- (86-36)= -7-50= -57
c) -123- { - (-15+86) -[ -11- (39-47)] } = -123- [ - 71 -( -11+8)] =
=-123- ( - 71 +3)= -123+68= -55
