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medses
@medses
July 2022
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8x в квадрате - 2x - 1 < 0
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dronmage90
8x^2-2x-1 <0
D=b^2-4ac=4+32=36
x1=2+6/16=1/8
x2=2-6/16=-1/4
8 (x-1/8)(x+1/4)
-----1/4-------1/8------>
+-+
Ответ: (1/4;1/8)
3 votes
Thanks 2
medses
А в учебнике ответ: -1,4<=х<=0 ?
medses
Я ошиблась с учебником, сорри!
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Answers & Comments
D=b^2-4ac=4+32=36
x1=2+6/16=1/8
x2=2-6/16=-1/4
8 (x-1/8)(x+1/4)
-----1/4-------1/8------>
+-+
Ответ: (1/4;1/8)