a) 47 + ( -115 ) -47 - ( -15 )
b) (-5) . (-7) . (-20) . (-3)
c) 120 - [ 50 - ( 12-22 )]
d) 108 - 15 + 25 . 3 - 72 : 23
e) ( 43 -863 ) - ( 137 - 57 )
g) 217 - [ -43 +217 - (-23)]
f) ( -23 ) + 175 + 23 + (-75)
h) 193 - ( 153 - 7.32 )
j) 175 - ( 3.52 - 5.32 )