tolong no 8-10 pakai cara nya ya

8. 15² - 16² : 8² = (15×15) - (16×16) : (8×8)
= 225 - 256 : 64 = 225 - 4 = C. 221

9. 3³ + 5³ × 2³ = (3×3×3) + (5×5×5) × (2×2×2)
= 27 + 125 × 8 = 27 + 1000 = A. 1.027

10. √784 : √196
√784 = 28
√196 = 14
28 : 14 = D. 2