Срочноооо! Заранее спасибо

N=UI [latex]N= \frac{U^{2}}{R} [/latex] [latex]R'=R_{1}+R_{2}[/latex] [latex]R''= \frac{R_{1}*R_{2}}{R_{1}+R_{2}} [/latex] [latex] \frac{N'}{N''}= \frac{U^{2}( \frac{R_{1}R_{2}}{R_{1}+R_{2}}) }{(R{1}+R_{2})U^{2}} = \frac{R{1}R_{2}}{(R_{1}+R_{2})^{2}} [/latex] [latex] \frac{N'}{N''}= \frac{100*200}{(100+200)^{2}}= \frac{20000}{90000} = \frac{2}{9} [/latex] Мощность увеличится в 4,5 раза