deletions | additions       diff --git a/untitled.tex b/untitled.tex  index 65eba35..20f4a5d 100644  --- a/untitled.tex  +++ b/untitled.tex 
...
\selectlanguage{english}$$  E(e^{2}(t+1))=(1-\frac{a+b}{a+b+c})^{2}*(a+b)+(\frac{a+b}{a+b+c})^{2}*c=\frac{c^{2}*(a+b)}{(a+b+c)^{2}}+\frac{c*(a+b)^{2}}{(a+b+c)^{2}}=\\=\frac{c*(a+b)*(c+a+b)}{(a+b+c)^{2}}=\frac{c*(a+b)}{a+b+c}=\frac{\delta^{2}_{N}*(E(e^{2}(t))+\delta^{2}_{E})}{E(e^{2}(t))+\delta^{2}_{E}+\delta^{2}_{N}}  $$  \selectlanguage{russian}Таким образом получаем:  \selectlanguage{english}$$  E(e^{2}(t+1))=\frac{\delta^{2}_{N}*(E(e^{2}(t))+\delta^{2}_{E})}{E(e^{2}(t))+\delta^{2}_{E}+\delta^{2}_{N}} - \selectlanguage{russian}среднее значение квадрата ошибки   $$