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= [(3 + 1 + 1/3)/(1/3^3 + 1/3^2 + 1/3)] + (3 + 1/3)^-1
= [(4 1/3)/(1/27 + 1/9 + 1/3)] + (3 1/3)^-1
= [(13/3)/(1/27 + 3/27 + 9/27)] + (10/3)^-1
= [(13/3)/(13/27)] + 3/10
= [(13/3) × 27/13] + 3/10
= 9 + 3/10
= 9 3/10 = 93/10
4. (2/5)^5 × (4/3)^-3 × (1/2)^2
= (32/3125) × (3/4)^3 × 1/4
= 32/3125 × 27/64 × 1/4
= 27/25000