Solve the following arithmetic problems: 1) 253.13 - 15.248 = 2) 420.55 : 5 = 3) 25.3 * 15.42 =

Решение:

1. \( 253.13 - 15.248 \)

Произведём вычитание:

\( \begin{array}{c} \phantom{00}253.130 \\ -\phantom{00}15.248 \\
ule{1.8cm}{0.4pt} \\ \phantom{00}237.882 \end{array} \)
2. \( 420.55 : 5 \)

Произведём деление:

\( \begin{array}{r} 84.11 \\ 5\overline{)420.55} \\ -40\downarrow \\
ule{0.5cm}{0.4pt} \\ \phantom{0}20 \\ -\phantom{0}20 \\
ule{0.5cm}{0.4pt} \\ \phantom{00}05 \\ \phantom{00}-\phantom{0}5 \\
ule{0.5cm}{0.4pt} \\ \phantom{000}05 \\ \phantom{000}-\phantom{0}5 \\
ule{0.5cm}{0.4pt} \\ \phantom{0000}0 \end{array} \)
3. \( 25.3 \times 15.42 \)

Произведём умножение:

\( \begin{array}{c} \phantom{000}15.42 \\ \times\phantom{00}25.3 \\
ule{1.8cm}{0.4pt} \\ \phantom{000}4626 \\ \phantom{0}7710 \\ 3084 \\
ule{1.8cm}{0.4pt} \\ 389.106 \end{array} \)

Ответ: 1) 237.882; 2) 84.11; 3) 389.106