[tex] (\frac{5}{7} + \frac{55}{77} +\frac{555}{777}):\frac{5}{7} -\frac{111}{500} :(\frac{1}{5} + \frac{1}{50} +\frac{1}{500})[/tex]
[tex]= (\frac{5}{7} + \frac{5}{7} +\frac{5}{7}):\frac{5}{7} -\frac{111}{500} :[\frac{1}{5}*(1 + \frac{1}{10} +\frac{1}{100})][/tex]
[tex]=\frac{15}{7}*\frac{7}{5} -\frac{111}{500} :(\frac{1}{5}*\frac{100+10+1}{100} )[/tex]
[tex]=\frac{15}{7}*\frac{7}{5} -\frac{111}{500} :(\frac{1}{5}*\frac{111}{100} )[/tex]
[tex]=3-\frac{111}{500} :\frac{111}{500}[/tex]
[tex]=3-\frac{111}{500} *\frac{500}{111}[/tex]
[tex]=3-1[/tex]
[tex]=2[/tex]
