Question

Дам 30, срочно, срочно, срочно

Answer 1

$25/28 sqrt{ frac{101^2-20^2}{125}} -1/45* sqrt{115^2-110^2}= \ 25/28 sqrt{ frac{(101-20)(101+20)}{125}} -1/45* sqrt{(115-110)(115+110)}= \ 25/28 sqrt{ frac{81*121}{125}} -1/45* sqrt{5*225}= \ 25/28 *9*11sqrt{ frac{1}{5*25}} -1/45* 15 sqrt{5}= \ 25/28 *99/5sqrt{ frac{1}{5}} -1/3 sqrt{5}= \ 5/28 *99sqrt{ frac{1}{5}} -1/3 sqrt{5}=99/28sqrt{ frac{25}{5}} -1/3 sqrt{5}= \ 297/84sqrt{5} -28/84 sqrt{5}=269/84sqrt{5}=3 frac{17}{84} sqrt{5}$



$-3/10 sqrt{frac{115^2-15^2}{130}} -1/17 sqrt{ frac{273^2-16^2}{257} } = \ -3/10 sqrt{frac{(115-15)(115+15)}{130}} -1/17 sqrt{ frac{(273-16)(273+16)}{257} } = \ -3/10 sqrt{frac{100*130}{130}} -1/17 sqrt{ frac{257*289}{257} } = \ -3/10 sqrt{100} -1/17 sqrt{289 } =-3/10 *10 -1/17 *17} = -3-1=-4$