12ab(5/6a + 1/4ab^2) =
= 12ab xx 5/6a + 12ab xx 1/4ab^2 =
= (12 xx 5/6)(a xx a)(b) + (12 xx 1/4)(a xx a)(b xx b^2) =
= 10a^2b + 3a^2b^3

Question

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