Toán Lớp 7: `(`81/12`-`9/4`)`.`(2/9)^2`-`2/9`

Question

Toán Lớp 7:  (81/12-9/4).(2/9)^2-2/9

cobebongdem · Answer

( 81/12 - 9/4 ) . ( 2/9 )^2 - 2/9   = ( 27/4 - 9/4 ) . 4/81 - 2/9   = 9/2 . 4/81 - 2/9   = 2/9 - 4/18   = 4/18 - 4/18   = 0

truongthanhhung · Answer

Giải đáp:   (81/12 - 9/4) . (2/9)^2 - 2/9   = 9/2 . (2/9)^2 - 2/9   = 2/9 . ( 9/2 . 2/9 - 1 )   = 2/9 . ( 1 - 1)   = 2/9 . 0 = 0