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14daria14
@14daria14
July 2022
2
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а)2х²+7х-9=0
б)3х²=18х
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VARVARAan
2х²
+7х-9=0
D=49+72=121
x1=(-7+11):4=1 ; x2=(-7-11):4=-4,5
Ответ : -4,5 и 1
1 votes
Thanks 2
zvezda0102
д = в²-4ас
zvezda0102
Д=121
zvezda0102
х12=-в+-11/4
zvezda0102
х1=1
zvezda0102
х2=-4,5
YukimuraRin2001
А)2х^2 +7х-9=0
D=49+72=121
Х1=-7-11/4=-4,5
Х2=-7+11/4=1
Б)3х^2=18х
3х^2-18х=0
Х(3х-18)=0
Х=0,3х-18=,х=6
0 votes
Thanks 2
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Answers & Comments
D=49+72=121
x1=(-7+11):4=1 ; x2=(-7-11):4=-4,5
Ответ : -4,5 и 1
D=49+72=121
Х1=-7-11/4=-4,5
Х2=-7+11/4=1
Б)3х^2=18х
3х^2-18х=0
Х(3х-18)=0
Х=0,3х-18=,х=6