27\sqrt{27}27 + 33\frac{3}{\sqrt{3}}33
= 9×3\sqrt{9 \times 3}9×3 + 3×33×3\frac{3 \times \sqrt{3}}{\sqrt{3} \times \sqrt{3}}3×33×3
= 33\sqrt{3}3 + 3\sqrt{3}3
= 43\sqrt{3}3
