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[ Mungkin soalnya (2x+y)³ ]
a³ + 3(a)²(b) + 3(a)(b)² + b³
(2x)² + 3(2x)²(y) + 3(2x)(y)² + y³
= 4x² + 6x²y + 6xy² + y³
Kalau memang soalnya (2y+y)³
Jawabannya : (3y)³ = 27y³