Cách 1:
(2015 - 45) : 5 = 1970 : 5 = 394
Cách 2:
( 2015 - 45) : 5 = 2015 : 5 - 45 : 5 = 403 - 9 = 394.
C1:(2015-45):5
= 1970 :5
= 394
C2:(2015-45):5
= 2015:5-45:5
= 403 -9
=394
C1 : ( 2015 - 45 ) : 5
= 1970 : 5
= 394
C2 : ( 2015 - 45 ) : 5
= 2015 : 5 - 45 : 5
= 403 - 9
= 394