a/
$\frac{23}{5}$ +$\frac{11}{13}$ -( $\frac{24}{13}$ + $\frac{18}{5}$ + $\frac{5}{17}$ )
=($\frac{23}{5}$ + $\frac{18}{5}$) +( $\frac{11}{13}$ - $\frac{24}{13}$ ) + $\frac{5}{17}$
=($\frac{23}{5}$+ $\frac{18}{5}$)+($\frac{11}{13}$ -$\frac{24}{13}$ )+$\frac{5}{17}$
=$\frac{41}{5}$ - 1 + $\frac{5}{17}$
=$\frac{36}{5}$ +$\frac{5}{17}$
=$\frac{612}{85}$ + $\frac{25}{85}$
=$\frac{637}{85}$
b/
|$\frac{-1}{4}$| -($\frac{-5}{6}$ )^0 -$\frac{7}{16}$ : ($\sqrt[]{\frac{1}{16}}$ -$\frac{2}{5}$ )
=$\frac{1}{4}$ -1-$\frac{7}{16}$ :$\frac{-3}{20}$
=$\frac{1}{4}$-1-$\frac{35}{-12}$ =$\frac{-3}{4}$ -$\frac{-35}{12}$ =$\frac{-9}{12}$ - $\frac{-35}{12}$ =$\frac{13}{6}$
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