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brighatt
@brighatt
March 2022
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Помогите решить систему уравнений! 9 класс!
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Опыт
X+y=5
x^3-3y=-15
********
y=5-x
x^3-15+3x=-15
********
y=5-x
x^3+3x=0
********
y=5-x
(x^2+3)*x=0
********
x=0
y=5
0 votes
Thanks 1
IUV
Verified answer
X=5-y
(5-y)^2-3y+15=0
25+y^2-10y-3y+15=0
y^2-13y+40=0
y=1/2(13+-3)
y1=8 x1=-3
y2=5 x2=0
0 votes
Thanks 2
mmb1
а куб откуда взялся то ?
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Answers & Comments
x^3-3y=-15
********
y=5-x
x^3-15+3x=-15
********
y=5-x
x^3+3x=0
********
y=5-x
(x^2+3)*x=0
********
x=0
y=5
Verified answer
X=5-y(5-y)^2-3y+15=0
25+y^2-10y-3y+15=0
y^2-13y+40=0
y=1/2(13+-3)
y1=8 x1=-3
y2=5 x2=0