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milen14
@milen14
November 2021
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помагите решать!!!
(2x-1)(3x+5)<0
(4x+3)(5x+2)>0
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Answers & Comments
Kamahana
1) х1 = 6/12 = 1/2
х2 = -20/12 = - 5/3
2)
х1 = (-23+7)/40 = - 2/5
х2 = (-23-7)/ = - 3/4
0 votes
Thanks 1
ElinaKravchenko
1) 6х^2 + 10х - 3х - 5 < 0
6х^2 + 7х - 5 < 0
D = 49 + 120 = 169
х1 = (-7+ 13)/12 = 1/2
х2 = (-7-13)/12 = - 5/3
1/2 > x > - 5/3
2) 20х^2 + 8х + 15х + 6 > 0
20х^2 + 23х + 6 > 0
D = 529 - 480 = 49
х1 = (-23+7)/40 = - 2/5
х2 = (-23-7)/ = - 3/4
-3/4 > х > -2/5
1 votes
Thanks 1
milen14
(1,2x-0,75)(7x-1)<0
milen14
a этот не скажите? буду очеень благодарно
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Answers & Comments
х2 = -20/12 = - 5/3
2) х1 = (-23+7)/40 = - 2/5
х2 = (-23-7)/ = - 3/4
6х^2 + 7х - 5 < 0
D = 49 + 120 = 169
х1 = (-7+ 13)/12 = 1/2
х2 = (-7-13)/12 = - 5/3
1/2 > x > - 5/3
2) 20х^2 + 8х + 15х + 6 > 0
20х^2 + 23х + 6 > 0
D = 529 - 480 = 49
х1 = (-23+7)/40 = - 2/5
х2 = (-23-7)/ = - 3/4
-3/4 > х > -2/5