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Sofyamelnikova1
@Sofyamelnikova1
July 2022
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1) х^2-8х+15>0
2)-2х^2+х+1 больше или равно 0
3)-х^2+3х-2<0
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vladimirlut
1) x²-8x+15>0
за теоремою Виета: х1= 5, х2= 3
2) -2х²+х+1≥0
Д=1+8=9
х1=-1+3/4=0,5
х2=-1-3/4=-1
3) -х²+3х-2<0
х²-3х+2>0
за теоремою Виета: х1= 2, х2= 1
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Answers & Comments
за теоремою Виета: х1= 5, х2= 3
2) -2х²+х+1≥0
Д=1+8=9
х1=-1+3/4=0,5
х2=-1-3/4=-1
3) -х²+3х-2<0
х²-3х+2>0
за теоремою Виета: х1= 2, х2= 1