tolong dijwb ,soal di gambar? srta caranya

9.
(4/81)²×(27/8)² = 16/6561×729/64 = 1/36

10.
4√8 × 5√3 = 20√24 = 40√6

11.
√448-2√28 = 8√7 - 4√7 = 4√7

12.
10+4√15-3√15-18 = -8 + √15

13.
14.
15.
(soalnya gak keliatan)