6. Write the following cubes in expanded form:(i) (2x + 1)³ (ii) (2a – 3b)³ (iii) [ (3/2)x + 1 ]³ (iv) (x – (2/3)y)³

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Evaluate the following using suitable identities:
(i) (99)³
(ii) (102)³
(iii) (998)³