Question

упростите выражение a-((a^2-5a)/(a+1))*(1/(a-5))

Answer 1

a-(a²-5a)/(a+1)*1/(a-5)
1)a(a-5)/(a+1)*1/(a-5)=a/(a+1)
2)a-a/(a+1)=(a²+a-a)/(a+1)=a²/(a+1)