a^2*2a=2a^3
54=2a^3
27=a^3
a=3
a×a×2+2a×a×4=9×2+6×3×4=18+72=90
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a^2*2a=2a^3
54=2a^3
27=a^3
a=3
a×a×2+2a×a×4=9×2+6×3×4=18+72=90