(2a/7)4×(7/8a)³×(4a/3)²
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(2a/7)4×(7/8a)^3×(4a/3)^2
(2a×4/7)×(7^3/8a^3)×(4a^2/3^2)
(8a/7)×(343/512a^3)×(16a^2/9)
after cancelling
49/36
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