Выражение:

10/25-b^4 + 1/5+b^2 - 1/5-b^2

Объяснение:

10/(25-b⁴) +1/(5+b²) -1/(5-b²)=10/((5-b²)(5+b²)) +(5-b²)/((5-b²)(5+b²)) -(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)