a) 714 + 382 + 286 + 318
= 1096 + 286 + 318
= 1382 + 318
= 1700
b) 18.73 + 15.18 + 12.18
= 18.(73 + 15 + 12)
= 18.100
= 1800
c) (37 + 63) : {250 : [450 - (4.5³ - 2². 25)]}
= 100 : {250 : [450 - (4.125 - 4.25)]}
= 100 : [250 : (450 - 400)]
= 100 : (250 : 50)
= 100 : 5
= 20