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\(A=\frac{4^5.9^4-2.6^9}{2^{10}.3^8+6^8.2^{10}}=\frac{2^{2.5}.3^{2.4}-2.2^9.3^9}{2^{10}.3^8+2^8.3^8.2^0}=\frac{2^{10}.3^8-2^{10}.3^9}{2^{10}.3^8+2^8.3^8}=\frac{2^{10}.3^8\left(1-3\right)}{2^8.3^8\left(2^2+1\right)}=\frac{4.-2}{5}=-\frac{8}{5}\)