Ответ:

\[11.56a^8-9.61b^{10}=(3.4a^4)^2-(3.1b^5)^2=(3.4a^4-3.1b^5)(3.4a^4+3.1b^5)\]

Ответ: \((3,4a^4-3,1b^5)(3,4a^4+3,1b^5)\).