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zehrasva
@zehrasva
June 2022
2
10
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x+y=3
x²+2xy+2y²=18
найдите y²
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Answers & Comments
tanka890
X+y=3
x^2+2xy+2y^2=18
x=3-y
(3-y)^2+2y(3-y)+2y^2=18
9-6y+y^2+6y-2y^2+2y^2=18
y^2+9=18
y^2=9
0 votes
Thanks 0
allym
Вот, решается так. 2у квадрат представляем как у^2+у^2
1 votes
Thanks 1
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Answers & Comments
x^2+2xy+2y^2=18
x=3-y
(3-y)^2+2y(3-y)+2y^2=18
9-6y+y^2+6y-2y^2+2y^2=18
y^2+9=18
y^2=9