a)

( 5/2 )^3 . ( 4/5 )^3

= ( 5/2 . 4/5 )^3

= 2^3 = 8

b)

( 1/9 )^2 : ( 1/3 )^3

= [ ( 1/3 )^2 ]^2 : ( 1/3 )^3

= ( 1/3 )^4 : ( 1/3 )^3

= 1/3

c)

( 9/5 )^5 : ( 27/-20 )^5

= ( 9/5 : 27/-20 )^5

= ( -4/3 )^5 = -1024/243

Đáp án:

Giải thích các bước giải:

 a) (5/2)^3*(4/5)^3

=(5/2*4/5)^3

=2^3

=8

b) (1/9)^2:(1/3)^3

=[(1/3)^2]^2:(1/3)^3

=(1/3)^4:(1/3)^3

=(1/3)^(4-3)

=1/3

c) (9/5)^5:(27/-20)^5

=(9/5:27/-20)^5

=(-4/3)^5

=-1024/243