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kristina00vjqgf
@kristina00vjqgf
August 2022
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Х^2-ху+у^2=63
У-х=3
Решить систему
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jampie
\left \{ {{ x^{2} - x(3+x) + (3+x)^2 = 63} \atop {y=3+x}} \right. \left \{ {{ x^{2} - x^{2} -3x + 9 + 18 x + x^{2} =63 } \atop {y=3+x}} \right. \left \{ {{ x^{2} + 15x - 54=0} \atop {y=3+x}} \right.
\left \{ {{(x-3)(x+18} \atop {x=2}} \right.
(x-3)(x+18)=0
y=3+x
x=3
y=6
x=-18
y=-15
два решения системы
0 votes
Thanks 0
jampie
я старалась, жаль, что вам будет не понятно :с
jampie
x^{2} - x(3+x) + (3+x)^2 = 63
y=3+x
x^{2} - x^{2} -3x + 9 + 18 x + x^{2} =63
y=3+x
x^{2} + 15x - 54
y=3+x
(x-3)(x+18)=0
y=3+x
x=3
y=6
x=-18
y=-15
ВикторияОстров
Y=x+3
x^2-x(x+3)+(x+3)^2=63
x^2-x^2-3x+ x^2+6X+9-63=0
x^2+3x-54=0
D=9+216=225 корень из дискриминанта = 15
x=6 x=-9
y=6+3=9 y=3-9=-6
1 votes
Thanks 1
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Answers & Comments
(x-3)(x+18)=0
y=3+x
x=3
y=6
x=-18
y=-15
два решения системы
y=3+x
x^{2} - x^{2} -3x + 9 + 18 x + x^{2} =63
y=3+x
x^{2} + 15x - 54
y=3+x
(x-3)(x+18)=0
y=3+x
x=3
y=6
x=-18
y=-15
x^2-x(x+3)+(x+3)^2=63
x^2-x^2-3x+ x^2+6X+9-63=0
x^2+3x-54=0
D=9+216=225 корень из дискриминанта = 15
x=6 x=-9
y=6+3=9 y=3-9=-6