Question

Упростите $(frac{3a}{a+3} + 3a) x frac{a+3}{3a ^{2} }$

Answer 1

$(frac{3a}{a+3} + 3a) cdot frac{a+3}{3a ^{2} }= frac{3a+3a(a+3)}{a+3} cdotfrac{a+3}{3a ^{2} }= frac{3a(1+a+3)}{a+3} cdotfrac{a+3}{3a ^{2} }= frac{a+4}{a}$