4 19/27
x = 2 1/3 - 2
= 1/3
x³ + 6x² + 12x =
= (1/3)³ + 6(1/3)² + 12(1/3)
= 1/27 + 6×1/9 + 12×1/3
= 1/27 + ⁹⁾2/3 + ²⁷⁾4
= (1 + 18 + 108)/27
= 127/27
= 4 19/27
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