Question

помогите решить 7задачку

Answer 1

(a²+3a)/[x(a-5)=8(a-5)]-a/x+8)=(a²+3a)/(a-5)(x+8)-a/(x+8)=(a²+3a-a²+5a)/(a-5)(x+8)=
=8a/(a-5)(x+8)

Answer 2

=(a³+3a)/((x(a-5)+8(a-5))-a/(x+8)=(a²+3a)/((a-5)(x+8))-a/(x+8)=
=(a²+3a-a(a-5))/((a-5)(x+8))=8a/((a-5)(x+8). 
Ответ: С.