x+xy+y=-1 x-xy+y=3 Решите систему. Created by qwerry2. algebra-ru

x+xy+y=-1 x-xy+y=3 Решите систему...

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Решение и ответ во вложении

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Task/27962996
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{ x +xy +y = -1 , || + || { x +y = 1 ,
{ x - xy +y = 3 . || - || { xy = - 2 .
x и y корни уравнения t² - t - 2 =0 ⇒ t₁ = -1 , t₂ = 2.

ответ : (-1 ; 2) , (2 ; -1) .

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