1.

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Answer»

( 3y + 1/4y)³

(3y)³ + (1/4y)³ + 3 × 3y × 1/4y ( 3y + 1/4y)

27y³ + 1/64y³+ 9/4 ( 3y + 1/4y)

27y³ + 1/64y³+ 27y/4 + 9/16y



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