Question

упростите выражение ​

Answer 1

$\dfrac{9a^{2}+y^{2}}{3a-y} +\dfrac{6ay}{y-3a}= \dfrac{9a^{2}+y^{2}}{3a-y} -\dfrac{6ay}{3a-y}=\dfrac{9a^{2}-6ay+y^{2}}{3a-y}=\\\\=\dfrac{(3a-y)^{2} }{3a-y} =\boxed{3a-y}$