\(\dfrac{25^2.5^3}{5^7}.1995=\dfrac{5^4.5^3}{5^7}.1995=\dfrac{5^7}{5^7}.1995=1.1995=1995\)
\(\dfrac{25^2.5^3}{5^7}.1995\)
\(=\dfrac{\left(5^2\right)^2.5^3}{5^7}.1995\)
\(=\dfrac{5^4.5^3}{5^7}.1995\)
\(=\dfrac{5^{4+3}}{5^7}.1995\)
\(=\dfrac{5^7}{5^7}.1995\)
\(=1.1995\)
\(=1995\)