0,5^6 *(-0,5)^8 *5^{-7}:0.05^{11}=\frac{0,5^6*0,5^8*(0,5*10)^{-7}}{(0,5*0,1)^{11}}=\frac{0,5^{14}*0,5^{-7}*10^{-7}}{0,5^{11}*(\frac{1}{10})^{11}}=
\frac{0,5^7*10^{-7}}{0,5^{11}*10^{-11}}=0,5^{7-11}*10^{-7-(-11)}=(\frac{1}{2})^{-4}*10^4=2^4*10^4=
=16*10000=160000