(1/5a+1/7a)*a^2/4 ////////////////////////

Question

(1/5a+1/7a)*a^2/4
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Answer 1

1/5а +1/7а = 7/35а + 5/35а = 12/35а
а^2/4 = а^1/2
12/35а • а^1/2 = 12/35а^3/2