Question

a^-11*a^3/a^-6 при а=2

Answer 1

$\frac{a^{-11}\cdot a^{3}}{a^{-6} } =a^{-11+3-(-6)}=a^{-11+3+6}=a^{-2}=\frac{1}{a^{2} }\\\\a=2 \ \Rightarrow \ \frac{1}{a^{2} }=\frac{1}{2^{2} }=\frac{1}{4}=\boxed{0,25}$