Question

(-1/12+2/5)-(0,36-0,64)-1 13/15=
решение по действиям.
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Answer 1

Пошаговое объяснение:

$\[\begin{gathered}\left( {-\frac{1}{{12}}+\frac{2}{5}} \right)-\left( {0,36-0,64} \right)-1\frac{{13}}{{15}} =-1,27 \hfill \\1)-\frac{1}{{12}}+\frac{2}{5}=-\frac{{1*5}}{{12*5}}+\frac{{2*12}}{{5*12}}=-\frac{5}{{60}} + \frac{{24}}{{60}} = \frac{{19}}{{60}} \hfill\\2)0,36-0,64=-0,28=-\frac{7}{{25}} \hfill \\3)\frac{{19}}{{60}}-\left( {-\frac{7}{{25}}} \right) = \frac{{19}}{{60}} + \frac{7}{{25}}=\frac{{19*5}}{{60*5}} + \frac{{7*12}}{{25*12}}=\frac{{95}}{{300}}+\frac{{84}}{{300}}=\frac{{179}}{{300}} \hfill \\4)\frac{{179}}{{300}} - 1\frac{{13}}{{15}}=\frac{{179}}{{300}}-\frac{{28}}{{15}}=\frac{{179}}{{300}}-\frac{{28*20}}{{15*20}}=\frac{{179}}{{300}}-\frac{{560}}{{300}} =-\frac{{381}}{{300}}=-\frac{{127}}{{100}}=-1,27 \hfill \\\end{gathered} \]$