Question

Помогите пожалуйста решить дробь!!!

Answer 1

=(10 +1*(5-b²) -1*(5+b²) / ((5-b²)(5+b²))=10+5-b²-5-b²  /((5-b²)(5+b²))=
=10-2b²/((5-b²)(5+b²))=2(5-b²)/((5-b²)(5+b²))=2/(5+b²)