Question

Помогите решить пример

Answer 1

$15* (frac{1}{5})^2=-6* frac{1}{5}= frac{1}{5}*(15* frac{1}{5}-6)= frac{1}{5}*( frac{15}{5}-6)= frac{1}{5}*(3-6)=- frac{3}{5}$