Bài `10:`

`a) ( (2/3)^3 . (3/4)^2 . (-1)^5)/( (2/5) . (-5/12)^2)`

` = ( (2/3)^2 . (3/4)^2 . 2/3 . (-1))/( 2/5 . 25/144)`

` = ( (2/3 . 3/4)^2 . (-2/3))/( 5/72)`

` = ( (1/2)^2 . (-2/3))/( 5/72)`

` = (1/4 . (-2)/3)/( 5/72)`

` = ( (-1)/6)/(5/72)`

` = -12/5`

`b) (6^6 + 6^3 . 3^3 + 3^6)/(-73)`

` = (3^6 . 2^6 + 3^3 . 2^3 . 3^3 + 3^6)/(-73)`

` = (3^6 . 64 + 3^6 . 8 + 3^6)/(-73)`

` = (3^6 . (64 + 8 + 1))/(-73)`

` = (729 . 73)/(-73) = -729`