18 X ( 424242373737 + 565656373737 + 727272373737 ) =

Câu 1: ( 4 điểm ): Tính nhanh

a.

32

:

75

x

75

:

32

+ 2009 =

b. 18 x (

424242373737

+

565656373737

+

727272373737

) =