\(\frac{7}{9} - \frac{2}{5} = \)...

\(\begin{array}{l}\frac{7}{9} - \frac{2}{5} = \frac{{35}}{{45}} - \frac{{18}}{{45}}\\ = \frac{{17}}{{45}}\end{array}\)

\(\begin{array}{l}\frac{5}{8} - \frac{1}{6} = \frac{{15}}{{24}} - \frac{4}{{24}}\\ = \frac{{11}}{{24}}\end{array}\)

\(\begin{array}{l}\frac{4}{7} - \frac{2}{{11}} = \frac{{44}}{{77}} - \frac{{14}}{{77}}\\ = \frac{{30}}{{77}}\end{array}\)

\[\begin{array}{l}\frac{6}{{13}} - \frac{1}{5} = \frac{{30}}{{65}} - \frac{{13}}{{65}}\\ = \frac{{17}}{{65}}\end{array}\]

\(\begin{array}{l}\frac{3}{4} - \frac{1}{{10}} = \frac{{15}}{{20}} - \frac{2}{{20}}\\ = \frac{{13}}{{20}}\end{array}\)

\(\begin{array}{l}\frac{8}{{11}} - \frac{3}{7} = \frac{{56}}{{77}} - \frac{{33}}{{77}}\\ = \frac{{23}}{{77}}\end{array}\)

\(\begin{array}{l}\frac{5}{6} - \frac{2}{9} = \frac{{15}}{{18}} - \frac{4}{{18}}\\ = \frac{{11}}{{18}}\end{array}\)

\(\begin{array}{l}\frac{4}{5} - \frac{3}{{14}} = \frac{{56}}{{70}} - \frac{{15}}{{70}}\\ = \frac{{41}}{{70}}\end{array}\)

\(\begin{array}{l}\frac{7}{{12}} - \frac{2}{{13}} = \frac{{91}}{{156}} - \frac{{24}}{{156}}\\ = \frac{{67}}{{156}}\end{array}\)

\[\begin{array}{l}\frac{6}{7} - \frac{1}{8} = \frac{{48}}{{56}} - \frac{7}{{56}}\\ = \frac{{41}}{{56}}\end{array}\]

\(\begin{array}{l}\frac{5}{9} - \frac{1}{4} = \frac{{20}}{{36}} - \frac{9}{{36}}\\ = \frac{{11}}{{36}}\end{array}\)

\[\begin{array}{l}\frac{4}{{11}} - \frac{2}{{15}} = \frac{{60}}{{165}} - \frac{{22}}{{165}}\\ = \frac{{38}}{{165}}\end{array}\]

\(\begin{array}{l}\frac{7}{{10}} - \frac{3}{8} = \frac{{28}}{{40}} - \frac{{15}}{{40}}\\ = \frac{{13}}{{40}}\end{array}\)

\(\begin{array}{l}\frac{6}{{13}} - \frac{1}{7} = \frac{{42}}{{91}} - \frac{{13}}{{91}}\\ = \frac{{29}}{{91}}\end{array}\)

\[\begin{array}{l}\frac{5}{6} - \frac{3}{{11}} = \frac{{55}}{{66}} - \frac{{18}}{{66}}\\ = \frac{{37}}{{66}}\end{array}\]

\(\begin{array}{l}\frac{4}{9} - \frac{1}{{12}} = \frac{{16}}{{36}} - \frac{3}{{36}}\\ = \frac{{13}}{{36}}\end{array}\)

\(\begin{array}{l}\frac{7}{8} - \frac{2}{5} = \frac{{35}}{{40}} - \frac{{16}}{{40}}\\ = \frac{{19}}{{40}}\end{array}\)

\[\begin{array}{l}\frac{5}{7} - \frac{3}{{10}} = \frac{{50}}{{70}} - \frac{{21}}{{70}}\\ = \frac{{29}}{{70}}\end{array}\]

\(\begin{array}{l}\frac{3}{4} - \frac{1}{9} = \frac{{27}}{{36}} - \frac{4}{{36}}\\ = \frac{{23}}{{36}}\end{array}\)

\(\begin{array}{l}\frac{6}{{11}} - \frac{2}{{13}} = \frac{{78}}{{143}} - \frac{{22}}{{143}}\\ = \frac{{56}}{{143}}\end{array}\)

\(\begin{array}{l}\frac{5}{{12}} - \frac{1}{8} = \frac{{10}}{{24}} - \frac{3}{{24}}\\ = \frac{7}{{24}}\end{array}\)

\(\begin{array}{l}\frac{4}{5} - \frac{2}{7} = \frac{{28}}{{35}} - \frac{{10}}{{35}}\\ = \frac{{18}}{{35}}\end{array}\)

\(\begin{array}{l}\frac{7}{9} - \frac{3}{{11}} = \frac{{77}}{{99}} - \frac{{27}}{{99}}\\ = \frac{{50}}{{99}}\end{array}\)

\(\begin{array}{l}\frac{6}{7} - \frac{2}{9} = \frac{{54}}{{63}} - \frac{{14}}{{63}}\\ = \frac{{40}}{{63}}\end{array}\)

\(\begin{array}{l}\frac{5}{{13}} - \frac{1}{6} = \frac{{30}}{{78}} - \frac{{13}}{{78}}\\ = \frac{{17}}{{78}}\end{array}\)

\(\begin{array}{l}\frac{4}{{11}} - \frac{1}{5} = \frac{{20}}{{55}} - \frac{{11}}{{55}}\\ = \frac{9}{{55}}\end{array}\)

\(\begin{array}{l}\frac{7}{{10}} - \frac{2}{{13}} = \frac{{91}}{{130}} - \frac{{20}}{{130}}\\ = \frac{{71}}{{130}}\end{array}\)

\(\begin{array}{l}\frac{5}{8} - \frac{3}{{14}} = \frac{{35}}{{56}} - \frac{{12}}{{56}}\\ = \frac{{23}}{{56}}\end{array}\)

\(\begin{array}{l}\frac{3}{4} - \frac{1}{{12}} = \frac{9}{{12}} - \frac{1}{{12}}\\ = \frac{8}{{12}} = \frac{2}{3}\end{array}\)

\(\begin{array}{l}\frac{6}{7} - \frac{2}{{11}} = \frac{{66}}{{77}} - \frac{{14}}{{77}}\\ = \frac{{52}}{{77}}\end{array}\)

\(\begin{array}{l}\frac{5}{9} - \frac{2}{{15}} = \frac{{25}}{{45}} - \frac{6}{{45}}\\ = \frac{{19}}{{45}}\end{array}\)

\(\begin{array}{l}\frac{4}{5} - \frac{1}{7} = \frac{{28}}{{35}} - \frac{5}{{35}}\\ = \frac{{23}}{{35}}\end{array}\)

\(\begin{array}{l}\frac{7}{{12}} - \frac{3}{{10}} = \frac{{35}}{{60}} - \frac{{18}}{{60}}\\ = \frac{{17}}{{60}}\end{array}\)

\(\begin{array}{l}\frac{6}{{13}} - \frac{2}{9} = \frac{{54}}{{117}} - \frac{{26}}{{117}}\\ = \frac{{28}}{{117}}\end{array}\)

\(\begin{array}{l}\frac{5}{8} - \frac{1}{{11}} = \frac{{55}}{{88}} - \frac{8}{{88}}\\ = \frac{{47}}{{88}}\end{array}\)

\(\begin{array}{l}\frac{4}{7} - \frac{1}{{10}} = \frac{{40}}{{70}} - \frac{7}{{70}}\\ = \frac{{33}}{{70}}\end{array}\)