[tex](\frac{1}{5a} +\frac{1}{7a} )*\frac{a^2}{4} =(\frac{7}{35a} +\frac{5}{35a} )*\frac{a^2}{4}=\frac{12}{35a} *\frac{a^2}{4} =\frac{3}{35} a\\\\\frac{3}{35} *7.7=\frac{3}{35} *\frac{77}{10} =\frac{3}{5} *\frac{11}{10} =\frac{33}{50}[/tex]
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[tex](\frac{1}{5a} +\frac{1}{7a} )*\frac{a^2}{4} =(\frac{7}{35a} +\frac{5}{35a} )*\frac{a^2}{4}=\frac{12}{35a} *\frac{a^2}{4} =\frac{3}{35} a\\\\\frac{3}{35} *7.7=\frac{3}{35} *\frac{77}{10} =\frac{3}{5} *\frac{11}{10} =\frac{33}{50}[/tex]