[tex]A=\frac{49^{25}\times 125^{10}\times 2^8+5^{30}\times (-7)^{49}\times 5^4}{16^2\times 5^{29}\times (-7)^{48}}=\frac{7^{50}\times 5^{30}\times 2^8+5^{30}\times (-7)^{49}\times 5^4}{2^8\times 5^{29}\times 7^{48}}=\frac{7^{49}\times 5^{30}\times (7\times 2^8-5^4)}{2^8\times 5^{29}\times 7^{48}}=\frac{7\times 5\times(7\times 2^8-5^4) }{2^8}[/tex]