Ответы на вопрос:
Выражаем x^2 x^2=8+y^2 подставляем: 8+y^2+2y^2=11 3y^2=11-8 3y^2=3 y^2=1 y1=1 y2=-1; x^2=8+1 x^2=9 x1=3 x2=-3 x^2=8+(-1)^2 x3=3 x4=-3 ответ: (3; 1), (-3; 1), (-3; -1), (3; -1)
{z+3> 3z-1⇒3z-z< 3+1⇒2z< 4⇒z< 2 {5z-1> 6-2z⇒5z+2z> 6+1⇒7z> 7⇒z> 1 {z-3< 0⇒z< 3 \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ //////////////////////////////////////////////////// \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ x∈(1; 2) {0,7(1+5z)< 0,5(z+1)+3z⇒0,7+3,5z< 0,5z+0,5+3z⇒3,5z-3,5z< -0,7 нет решен {2z-(2-1,7)> 6,7⇒2z-0,3> 6,7⇒2z> 7⇒z> 3,5 x∈∅
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