a = 40 + 60 : 2 - 20
a = 40 + 30 - 20
a = 70 - 20
a = 50
b = ( 17 + 17 × 4 : 17 )
b = ( 17 + 68 : 17 )
b = ( 17 + 4 )
b = 21
c = ( 37 × 3 - 37 ) : 74
c = ( 111 - 37 ) : 74
c = 74 : 74
c = 1
5 × 50 + 4 × 21 - 3 × 1 + 33 =
250 + 84 - 3 + 33 =
334 - 3 + 33 =
331 + 33 = 364