Question

упростите выражение 2a/a-5-5/a+5+2a²/25-a²

Answer 1

общий знаменатель 25 -a² =(5 -a)(5 +a) = -(a -5)(a +5)

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

=(2a² +10a -5a +25 -2a²) /(a -5)(a +5) =

=(5a +25) /(a -5)(a +5) =

=5(a +5) /(a -5)(a +5) =

=5 /(a -5)