Решите систему уравнений способом подстановки
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{x²+y²=9
{x+y=3
x=3-y
(3-y)²+y²=9
9-6y+y²+y²-9=0
2y²-6y=0
2y(y-3)=0
y=0⇒x=3
y=3⇒x=0
(3;0);(0;3)


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