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DianaGogitidze
@DianaGogitidze
July 2022
1
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5x-4y=1
-2x+5y=20
Решите пожалуйста 3 способами
Графически, - и +
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Answers & Comments
ann1885
Сис
5х-4у=1
-2х+5у=20
сис
10х-8у=2
-10х+25у=100
"+" складываем
-8у+25у=2+100
17у=102
у=102/17
у=6
5х-4*6=1
5х=25
х=5
ответ (5;6)
сис
5х-4у=1 *5
-2х+5у=20 *-4
сис
25х-20у=5
8х-20у=-80
"-"
25х-8х=5-(-80)
17х=85
х=85/17
х=5
25-4у=1
4у=24
у=6
ответ (5;4)
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Answers & Comments
5х-4у=1
-2х+5у=20
сис
10х-8у=2
-10х+25у=100
"+" складываем
-8у+25у=2+100
17у=102
у=102/17
у=6
5х-4*6=1
5х=25
х=5
ответ (5;6)
сис
5х-4у=1 *5
-2х+5у=20 *-4
сис
25х-20у=5
8х-20у=-80
"-"
25х-8х=5-(-80)
17х=85
х=85/17
х=5
25-4у=1
4у=24
у=6
ответ (5;4)