Question

Найдите значения выражения 7(1/7)^2-15*1/7

Answer 1

$7*( \frac{1}{7}) ^{2}- 15* \frac{1}{7}= \frac{1}{7}(7* \frac{1}{7}-15)= \frac{1}{7}(1-15)= \frac{1}{7}*(-14)=-2$

Answer 2

$7* \frac{1}{49} -15* \frac{1}{7} = \frac{1}{7} - \frac{15}{7} =- \frac{14}{7}=-2$