Question

найдите значения выражения 21*(1/7)2-10*1/7

Answer 1

$\\21*(\frac{1}{7})^2 - 10 * \frac{1}{7} = \frac{1}{7} * (21*\frac{1}{7} - 10) = \frac{1}{7}(3 - 10) = \\ = \frac{1}{7} * (-7) = -1$