Ответ:

\[2.25k^4-2.56p^4=(1.5k^2)^2-(1.6p^2)^2=(1.5k^2-1.6p^2)(1.5k^2+1.6p^2)\]

Ответ: \((1,5k^2-1,6p^2)(1,5k^2+1,6p^2)\).