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LizPesh
@LizPesh
June 2022
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Реши систему уравнений x+y=−4
x−y=18
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Amelie13
Решаю способом сложения.
2х=14
х=7
7+у=-4
у=-11
Ответ: (7;-11)
2 votes
Thanks 2
ГинНик
Y=-4-x
x-y=18
y=-4-x
x-(-4-x)=18
y=-4-x
2x+4=18
y=-4-x
2x=14
y=-4-x
x=7
y=-4-7
x=7
y=-11
x=7
0 votes
Thanks 0
ГинНик
я замещением попробовал
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Answers & Comments
2х=14
х=7
7+у=-4
у=-11
Ответ: (7;-11)
x-y=18
y=-4-x
x-(-4-x)=18
y=-4-x
2x+4=18
y=-4-x
2x=14
y=-4-x
x=7
y=-4-7
x=7
y=-11
x=7