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adelinatronina
@adelinatronina
July 2022
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Решите систему уравнений за 6 класс
1)у-2х=-2
3х-2у=1
2)3х+у=1
5х-2у=9
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belozerova1955
№1.
у-2х=-2
3х-2у=1
у=2х-2
3х-2·(2х-2)=1
3х-4х+4=1
-х=1-4
-х=-3
х=3
у=2·3-2=4
Ответ: х=3; у=4 или (3;4)
№2.
3х+у=1
5х-2у=9
у=1-3х
5х-2·(1-3х)=9
5х-2+6х=9
5х+6х=9+2
11х=11
х=1
у=1-3х=1-3·1=-2
Ответ: (1; -2)
2 votes
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Answers & Comments
у-2х=-2
3х-2у=1
у=2х-2
3х-2·(2х-2)=1
3х-4х+4=1
-х=1-4
-х=-3
х=3
у=2·3-2=4
Ответ: х=3; у=4 или (3;4)
№2.
3х+у=1
5х-2у=9
у=1-3х
5х-2·(1-3х)=9
5х-2+6х=9
5х+6х=9+2
11х=11
х=1
у=1-3х=1-3·1=-2
Ответ: (1; -2)