27.
use neative rule
1 / (1/4 )
then invert and multiply
answer 4
28.
negative rule
1 / (2/5) ^2
then division dis
1 / (2^2/5^2)
simplify 2^2 to 4
then simplift 5^2 to 25
invert and mul
answer 25/4
29.
negative rule
1/ (-1/3^3)
then division dis
1 / (-1/3^3)
simplify 3^3 to 27
move negative sign to left
invert
answer -27
30.
negative rule
1 / (-2/3)^3
since the power of 3 is odd, the result will be negative
1/ -(2/3)^3
division dis
1/ - (2^3 / 3^3)
simplify 2^3 to 8
simplify 3^3 to 27
move negative sign to left
invert
- 1 / - (8/27)
answer - 27/8
