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olka9907
@olka9907
August 2022
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Система ур-е
х+у=1
x^2+y^2=25
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Answers & Comments
nastasiya98
X=1-y
(1-y)²+y²=25
1-2y+y²+y²-25=0
2y²-2y-26=0
y²-y-12=0
y₁=4
y₂=-3
x₁=1-4=-3
x₂1-(-3)=1+3=4
0 votes
Thanks 2
olka9907
А как 2y получилось?
nastasiya98
(1-y)^2=1-2y+y^2
nastasiya98
(a-b)^2=a^2-2ab+b^2
nastasiya98
формулы сокращенного умножения
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Answers & Comments
(1-y)²+y²=25
1-2y+y²+y²-25=0
2y²-2y-26=0
y²-y-12=0
y₁=4
y₂=-3
x₁=1-4=-3
x₂1-(-3)=1+3=4