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@Amadins
September 2021
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Решите пожалуйста уравнения, пропустила тему
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katesgo
4. а) х+9 = 16
х+9-16=0
х-7=0
х=7
ответ:х=7
б) х²-4х=5
х²-4х-5=0
д = b²-4ac = (-4)²-4*1*(-5) =36
x1= -2/2=-1
x2=10/2=5
ответ : х=-1;х=5
в) 4х+5=2х+1
4х+5-2х-1=0
2х+4=0
2х=-4
х=-2
ответ: х=-2
г)2х+15=2х-1=2х+9
2х+15-2х+1-2х-9=0
-2х+7=0
-2х=-7
х=-7/-2
х=7/2
х=3.5
ответ: х=3.5
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Answers & Comments
х+9-16=0
х-7=0
х=7
ответ:х=7
б) х²-4х=5
х²-4х-5=0
д = b²-4ac = (-4)²-4*1*(-5) =36
x1= -2/2=-1
x2=10/2=5
ответ : х=-1;х=5
в) 4х+5=2х+1
4х+5-2х-1=0
2х+4=0
2х=-4
х=-2
ответ: х=-2
г)2х+15=2х-1=2х+9
2х+15-2х+1-2х-9=0
-2х+7=0
-2х=-7
х=-7/-2
х=7/2
х=3.5
ответ: х=3.5