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it means you multiply the number or variable by it self three times.
For example,

43 = 4*4*4 = 64
53 = 5*5*5 = 125
x3 = x*x*x

3x3 = 3*x*x*x
(3x)3 = 3x*3x*3x= 27x3

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15y ago

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