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alinamalinachka
@alinamalinachka
July 2022
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Помогите пожалуйста !Решите систему .
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volochkos
X=5+y подставим во второе урапвнение
(5+y)^2-15y=109
25+10y+y^2-15y=109
y^2-5y-84=0
D=(-5)^2-4*(-84)=25+336=361
y1=(5-19)/2=-14/2=-7
y2=(5+19)/2=24/2=12
x1=5+(-7)=-2
x2=5+12=17
Ответ (-2;-7) ,(12;17)
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Answers & Comments
(5+y)^2-15y=109
25+10y+y^2-15y=109
y^2-5y-84=0
D=(-5)^2-4*(-84)=25+336=361
y1=(5-19)/2=-14/2=-7
y2=(5+19)/2=24/2=12
x1=5+(-7)=-2
x2=5+12=17
Ответ (-2;-7) ,(12;17)