Question

ПОМОГИТЕ СРОЧНО ДАЮ БАЛЛЫ!!!1

Answer 1

$\displaystyle\bf\\u=xy \ \ ; \ \ v=x-y\\\\\\\left \{ {{2\underbrace{xy}_{u}+\underbrace{x-y}_{v}=7} \atop {\underbrace{xy}_{u}\ \ (\underbrace{x-y}_{v})=-10}} \right. \\\\\\Otvet \ : \ 1) \ \left \{ {{2u+v=7} \atop {uv=-10}} \right.$