$\frac{3}{8}+\frac{-2}{5}+\frac{7}{8}-\frac{4}{5}\backslash frac\{3\}\{8\}+\backslash frac\{-2\}\{5\}+\backslash frac\{7\}\{8\}-\backslash frac\{4\}\{5\}$ = ……

If we subtract $\frac{3}{5}\backslash frac\{3\}\{5\}$ from $\frac{7}{20}\backslash frac\{7\}\{20\}$ we get ……

The sum of two Rational numbers is $\frac{1}{2}\backslash frac\{1\}\{2\}$ and one of the numbers is $\frac{-8}{19}\backslash frac\{-8\}\{19\}$ then the second number is ……

How much can be added to -2 to get $\frac{7}{9}\backslash frac\{7\}\{9\}$?

$4-(2\frac{2}{3}+3\frac{1}{5})4-(2\backslash frac\{2\}\{3\}+3\backslash frac\{1\}\{5\})$ = ……

$\frac{2}{3}\times \frac{-5}{6}\backslash frac\{2\}\{3\}\backslash times\backslash frac\{-5\}\{6\}$ = ……

$\frac{7}{9}\times 1\frac{1}{2}\times 8\frac{1}{17}\times (\frac{1}{2}-\frac{1}{2})\backslash frac\{7\}\{9\}\backslash times\; 1\backslash frac\{1\}\{2\}\backslash times8\backslash frac\{1\}\{17\}\backslash times(\backslash frac\{1\}\{2\}-\backslash frac\{1\}\{2\})$ = ……

$((\frac{5}{9}{)}^{-1}{)}^{-1}((\backslash frac\{5\}\{9\})^\{-1\})^\{-1\}$

$(\frac{1}{-8}{)}^{-1}(\backslash frac\{1\}\{-8\})^\{-1\}$ = ……

x = $\frac{-1}{5}\backslash frac\{-1\}\{5\}$ y = $\frac{2}{7}\backslash frac\{2\}\{7\}$ then xy = ……