[tex]\frac{49^{24}.125^{10}.2^{8}-5^{30}.7^{39}.4^{5}}{5^{29}.16^{2}.7^{48}}[/tex]
[tex]=\frac{7^{48}.5^{30}.2^{8}-5^{30}.7^{39}.2^{10}}{5^{29}.2^{8}.7^{48}}[/tex]
[tex]=\frac{7^{39}.5^{30}.2^{8}.(7^{9}-2^2)}{5^{29}.2^8.7^{48}}[/tex]
[tex]=\frac{5.(7^9-2^2)}{7^9}[/tex]
[tex]=\frac{5.7^9-20}{7^9}=5-\frac{20}{7^9}[/tex]