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Deom2109
@Deom2109
July 2022
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Помогите с алгеброй
помогите пожалуйста, я просто тупой немного.
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НикРЖУ
1.
x+y=6
5x-2y=9
x=6-y
5(6-y)-2y=9
30-5y-2y=9
30-7y=9
7y=21
y=3
x=6-y
x=3
2.
x^2+4y=8
x+y=2
y=2-x
x^2+4(2-x)=8
x^2+8-4x-8=0
x^2-4x=0
x(x-2)=0
x1=0 x2=2
y1=2 y2=0
3.
x-2y=2
2xy=3
x=2+2y
2y(2+2y)=3
4y+4y^2-3=0
D=16+48=64
y1=(4+8)/8=12/8=1.5
y2=(4-8)/8=-0.5
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Answers & Comments
x+y=6
5x-2y=9
x=6-y
5(6-y)-2y=9
30-5y-2y=9
30-7y=9
7y=21
y=3
x=6-y
x=3
2.
x^2+4y=8
x+y=2
y=2-x
x^2+4(2-x)=8
x^2+8-4x-8=0
x^2-4x=0
x(x-2)=0
x1=0 x2=2
y1=2 y2=0
3.
x-2y=2
2xy=3
x=2+2y
2y(2+2y)=3
4y+4y^2-3=0
D=16+48=64
y1=(4+8)/8=12/8=1.5
y2=(4-8)/8=-0.5