Question

Найдите значение выражения
10×(1/5)^2-7/10

Answer 1

$10 \times \frac{1}{25} - \frac{7}{10} = 2 \times \frac{1}{5} - \frac{7}{10} = \frac{2}{5} - \frac{7}{10} = - \frac{3}{10} = - 0.3$

Answer 2

$10 \times {( \frac{1}{5} )}^{2} - \frac{7}{10} = 10 \times \frac{ {1}^{2} }{ {5}^{2} } - \frac{7}{10} = 10 \times \frac{1}{25} - \frac{7}{10} = \frac{10}{25} - \frac{7}{10} = \frac{20}{50} - \frac{35}{50} = - \frac{15}{50} = - \frac{3}{10}$