a)
( 5 + 5 ) : 5 - 5 : 5 = 1
= 10 : 5 - 1 =
= 2 - 1 =
= 1
b)
5 + 5 + 5 - 5 - 5 = 5
= 15 - 5 - 5 =
= 10 - 5 =
= 5
sau:
5 : 5 + ( 5 - 5 : 5 ) = 5
= 1 + ( 5 - 1 ) =
= 1 + 4 =
= 5
sau:
5 × 5 : 5 + 5 - 5 = 5
= 25 : 5 + 5 - 5 =
= 5 + 5 - 5 =
= 10 - 5 =
= 5
c)
5 × ( 5 : 5 + 5 : 5 ) = 10
= 5 × ( 1 + 1 ) =
= 5 × 2 =
= 10