Question

Решите три пятых +0,8 2,5-одна целая одна третья

две пятых умножить на 3,5

Answer 1

$\frac{3}{5} + 0.8 = \frac{3}{5} + \frac{8}{10} = \frac{6}{10} + \frac{8}{10} = \frac{14}{10} = 1.4$

$2.5 - 1 \frac{1}{3} = 2.5 - \frac{4}{3} = \frac{25}{10} - \frac{4}{3} = \frac{75}{30} - \frac{40}{30} = \frac{35}{30} = \frac{7}{6} = 1 \frac{1}{6}$

$\frac{2}{5} \times 3.5 = \frac{2}{5} \times \frac{35}{10} = \frac{2 \times 35}{5 \times 10} = \frac{1 \times 7}{1 \times 5} = \frac{7}{5} = 1 \frac{2}{5} = 1.4$