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Alissa2014
@Alissa2014
July 2022
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Розв'язати систему рівнянь очень нужно
[tex] \left \{ { \frac{x}{y} - \frac{y}{x} = \frac{5}{6} \atop {x+y=5}} \right. [/tex].
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duadna23
(х-у)(х+у)=5ху/6; х+у=5; х=5-у; (5-2у) *5=5(5-у)у/6; 30-12у=5у-у^2;у^2-17у+30=0; Д=17*17-4*30=169=13*13; у1=(1-13)/2=-6; у2=(1+13)/2=7; х1=5+6=11; х2=5-7=-2
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