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Вера44
@Вера44
September 2021
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Добрый вечер , помогите решить системки , пожалуйста
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Бершинск
Xy=-2
1/x+1/y=1/2
x=-2/y
-y/2+1/y=1/2
(-y^2+2-y)/2y=0
-y^2-y+2=0
D=1+8=9
y1=(1+3)/(-2)= -2
y2=(1-3)/(-2)=1
1) y1=-2
x1=-2/(-2)=1
2) y2=1
x2=-2/1=-2
1/x-1/y=1
2/x-1/2y=5
1/x=1+1/y
2*(1+1/y) - 1/2y=5
2+2/y-1/2y=5
2/y-1/2y-3=0
(6-3-y)/6y=0
(3-y)/6y=0
3-y=0
y=3
1/x=1+1/3
1/x=4/3
x=3/4
x=3/4
y=3
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Answers & Comments
1/x+1/y=1/2
x=-2/y
-y/2+1/y=1/2
(-y^2+2-y)/2y=0
-y^2-y+2=0
D=1+8=9
y1=(1+3)/(-2)= -2
y2=(1-3)/(-2)=1
1) y1=-2
x1=-2/(-2)=1
2) y2=1
x2=-2/1=-2
1/x-1/y=1
2/x-1/2y=5
1/x=1+1/y
2*(1+1/y) - 1/2y=5
2+2/y-1/2y=5
2/y-1/2y-3=0
(6-3-y)/6y=0
(3-y)/6y=0
3-y=0
y=3
1/x=1+1/3
1/x=4/3
x=3/4
x=3/4
y=3