Question

Сократите и приведите к общ. знаменателю:
2а/а-5 - 5/а+5 + 2а^2/25-а^2=

Answer 1

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)