Най­ди­те зна­че­ние вы­ра­же­ния 5*([latex] \frac{1}{5} [/latex])^2-16*[latex]\frac{1}{5} [/latex]

[latex]5\cdot \Big ( \frac{1}{5}\Big )^2-16\cdot \frac{1}{5}= \frac{1}{5}\cdot \Big (5\cdot \frac{1}{5} -16\Big )= \frac{1}{5}\cdot (1-16)=\frac{1}{5}\cdot (-15)=-3 [/latex]