Question

tính  nhanh:

5 + 10 + 5 + 10 + (10 x 2)

Answer 1

5 + 10 + 5 + 10 + (10 x 2)

= (5 + 5) + 10 + 20

=    10    + 10 + 20

=     40

Answer 2

5 + 10 + 5 + 10 + ( 10 x 2 )

= 5 + 10 + 5 + 10 + 20

= ( 5 + 5 ) + ( 10 + 10 ) + 20

= 10 + 20 + 20

= 50

Answer 3

5 + 10 + 5 + 10 + (10 x 2)

= (5 + 5) + (10 + 10) + 20

=    10    +      20      + 20

=     50