26) \(\frac{4a^3(a-5)^2}{40c}=\)

Сократим коэффициенты \(4/40=1/10\):

\(\frac{4a^3(a-5)^2}{40c}=\frac{a^3(a-5)^2}{10c}\).

Ответ: \(\frac{a^3(a-5)^2}{10c}\), при \(c\ne0\).