[tex](5 {}^{ - 101} - {5}^{ - 103} ) \div (1.2 \times 5 {}^{ - 102} )[/tex]
[tex]( \frac{1}{5 {}^{101} } - \frac{1}{ {5}^{103} } ) \div ( \frac{6}{5} \times 5 {}^{ - 102} )[/tex]
[tex] \frac{ {5}^{2} - 1 }{5 {}^{103} } \div \frac{6 \times 5 {}^{ - 102} }{5} [/tex]
[tex] \frac{25 - 1}{5 {}^{103} } \times \frac{5}{6 \times 5 {}^{ - 102} } [/tex]
[tex] \frac{24}{5 {}^{102} } \times \frac{1}{6 \times 5 {}^{ - 102} } [/tex]
[tex] \frac{4}{5 {}^{102} } \times \frac{1}{5 {}^{ - 102} } [/tex]
[tex] \frac{4}{1} [/tex]
[tex]4[/tex]