[tex]\frac{\frac{9}{5} :\frac{3}{7} -3\frac{3}{4}*\frac{2}{5} }{5\frac{1}{4} *\frac{3}{7} }= \frac{\frac{9}{5} *\frac{7}{3} -\frac{15}{4}*\frac{2}{5} }{\frac{21}{4} *\frac{3}{7} }=\frac{\frac{3}{5} *\frac{7}{1} -\frac{3}{2}*\frac{1}{1} }{\frac{3}{4} *\frac{3}{1} }=\frac{\frac{21}{5} -\frac{3}{2} }{\frac{9}{4} }=\frac{\frac{42}{10} -\frac{15}{10} }{\frac{9}{4} }=\frac{\frac{27}{10} }{\frac{9}{4} }=\frac{\frac{27}{10} } }[/tex]
[tex]=\frac{27}{10} *\frac{4}{9} =\frac{3}{5} *\frac{2}{1} =\frac{6}{5} =1\frac{1}{5}[/tex]
Pozdrawiam.
