{[9/8-(1-5/4)]×(-2/5)+[7/4×(-3/5)+1/2]}:1/2 Risultato 11/5

Se il testo è scritto correttamente [attach]827[/attach] il risultato è con il segno negativo, ecco lo svolgimento: [attach]832[/attach]

Algebra

ciao , ecco

$\left\{\left[\frac{9}{8}-\left(1-\frac{5}{4}\right)\right]\times \left(-\frac{2}{5}\right)+\left[\frac{7}{4}\times \left(-\frac{3}{5}\right)+\frac{1}{2}\right]\right\}:\frac{1}{2}=$
$=\left\{\left[\frac{9}{8}-\left(\frac{4-5}{4}\right)\right]\times \left(-\frac{2}{5}\right)+\left[\frac{7}{4}\times \left(-\frac{3}{5}\right)+\frac{1}{2}\right]\right\}:\frac{1}{2}=$
$=\left\{\left[\frac{9}{8}-\left(-\frac{1}{4}\right)\right]\times \left(-\frac{2}{5}\right)+\left[\left(-\frac{21}{20}\right)+\frac{1}{2}\right]\right\}:\frac{1}{2}=$
$=\left\{\left[\frac{9}{8}-\left(-\frac{1}{4}\right)\right]\times \left(-\frac{2}{5}\right)+\left[-\frac{21}{20}+\frac{1}{2}\right]\right\}:\frac{1}{2}=$
$=\left\{\left[\frac{9}{8}+\frac{1}{4}\right]\times \left(-\frac{2}{5}\right)+\left[\frac{-21+10}{20}\right]\right\}:\frac{1}{2}=$
$=\left\{\left[\frac{9+2}{8}\right]\times \left(-\frac{2}{5}\right)+\left[-\frac{11}{20}\right]\right\}:\frac{1}{2}=$
$=\left\{\left[\frac{11}{8}\right]\times \left(-\frac{2}{5}\right)+\left[-\frac{11}{20}\right]\right\}:\frac{1}{2}=$
$=\left\{\left(-\frac{11}{20}\right)-\frac{11}{20}\right\}:\frac{1}{2}=$
$=\left\{-\frac{11}{20}-\frac{11}{20}\right\}:\frac{1}{2}=$
$=\left\{\frac{-11-11}{20}\right\}:\frac{1}{2}=$
$=\left\{-\frac{22}{20}\right\}:\frac{1}{2}=$
$=\left\{-\frac{\not{22}^{11}}{\not{20}^{10}}\right\}:\frac{1}{2}=$
$=\left\{-\frac{11}{10}\right\}\times \frac{2}{1}=$
$=\left(-\frac{11}{5}\right)=$
$=-\frac{11}{5}$