Question

Найдите значение выражений.

Answer 1

Пошаговое объяснение:

$\[\begin{gathered}3+\frac{1}{3}*0.39=\boxed{3.13} \hfill \\1)\frac{1}{3}*0.39=\frac{1}{3}*\frac{{39}}{{100}}=\frac{{13}}{{100}}=0.13 \hfill \\2)3+0.13=3.13 \hfill \\ \end{gathered} \]$

$\[\begin{gathered}4+\frac{1}{{11}}*1.32=\boxed{4.12} \hfill \\1)\frac{1}{{11}}*1.32=\frac{1}{{11}}*1\frac{{32}}{{100}}=\frac{1}{{11}}*\frac{{33}}{{25}}=\frac{3}{{25}}=0.12 \hfill \\2)4+0.12=4.12 \hfill \\ \end{gathered} \]$

$\[\begin{gathered}\frac{{31}}{{15}}-0.3*\frac{2}{9}=\boxed2 \hfill \\1)0.3*\frac{2}{9}=\frac{3}{{10}}*\frac{2}{9}=\frac{1}{{15}} \hfill \\2)\frac{{31}}{{15}}-\frac{1}{{15}}=\frac{{30}}{{15}}=2 \hfill \\ \end{gathered} \]$