(2x)³+3(2x)²•3y+3•2x(3y)²+(3y)³
8x³+3(4x²)•3y+3•2x(9y²)+27y³
8x³+36x²y+54xy²+27y³
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(2x)³+3(2x)²•3y+3•2x(3y)²+(3y)³
8x³+3(4x²)•3y+3•2x(9y²)+27y³
8x³+36x²y+54xy²+27y³