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= 5²/2³ *(3/8 + 3² * (4*3⁻¹ -3⁻¹))⁻¹ = 5²/2³ *(3/8 + 3² * 3⁻¹ *(4 - 1))⁻¹ =
= 5²/2³ *(3/8 + 3² * 3⁻¹ *3¹)⁻¹ = 5²/2³ *(3/8 + 3²)⁻¹ = 5²/2³ *(75/8)⁻¹ =
= 25/8 * 8/75 = 1/3