Tính giá trị của biểu thức: A= 25^6 +5^4/ 25^5+25.

$A=\frac{{25}^6+5^4}{{25}^5+25}$

$A=\frac{{\left(5^2\right)}^6+5^4}{{\left(5^2\right)}^5+5^2}$

$A=\frac{5^{12}+5^4}{5^{10}+5^2}$

$A=\frac{5^{8+4}+5^4}{5^{8+2}+5^2}$

$A=\frac{5^8{.5}^4+5^4}{5^8{.5}^2+5^2}$

$A=\frac{5^4.\left(5^8+1\right)}{5^2.\left(5^8+1\right)}$

A = $\frac{5^4}{5^2}=5^2$.