[tex](81) \frac{3}{4} + (16) \frac{3}{4} \\ (125) \frac{2}{3} - (27) \frac{2}{3} [/tex]

(81)^3/4 + (16)^3/4
= (3^4)^3/4 + (2^4)^3/4
= (3)^(4×3/4) + (2)^(4×3/4)
= 3^3 + 2^3
= 27 + 8
= 35
b) (125)^2/3 - (27)^2/3
= (5^3)^2/3 - (3^3)^2/3
= (5)^3×2/3 - (3)^3×2/3
= 5^2 - 3^2
= 25 - 9
= 16