The expression that is a perfect cube in the option is 216x¹⁸.
Perfect cubes are the numbers that are the triple product of the same number.
In other words a perfect cube is a number that is obtained by multiplying the same integer three times.
Therefore, it can be represented as follows;
x × x × x = x³
Hence, the perfect cube in the option is as follows;
216x¹⁸ = 6x⁶ × 6x⁶ × 6x⁶
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