sederhanakan (12-3√25+8^1/3)^-1/2 tolong bantu caranya iya guys

( 12 - 3 √ 25 + 8^1/3 ) ^2 - 1/2
( 12 - 3.5 + 1 / 6.561 ) ^2 - 1/2
( 12 - 15 + 1 / 6.561 ) ^2 - 1/2
( - 3 / 1 + 1 / 6.561 ) ^2 - 1/2
- 19.683 / 6.561 ^2 - 1 / 2
- 3^2 - 1 / 2
9 - 1/2
9/1 - 1/2
18 / 2 - 1 / 2
17 / 2
8,5