Question

(20а(во 4 степени) -4а(во 3 степени) d) :4а

Answer 1

$frac{ {20a}^{4} - {4a}^{3}d }{4a} = frac{4a( {5a}^{3} - {a}^{2}d) }{4a} = {5a}^{3} - {a}^{2} d$