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janis2990
@janis2990
September 2021
2
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Решить неравенство. 3x в квадрате -7x+4 меньше 0.
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NastyaMus
................................................................
1 votes
Thanks 2
uchilka2012
3х²-7х+4≤0
Вычислим дискриминант:
D=b
²
−
4a
c
=
(
−7
)
²
−
4·3
·4
=
49−48
=1
Вычислим корни:
х
₁=
−b
+
√D/
2a
=
−
(
−7
)
+1/
2·3
=
8/6
=4/3
х
₂=
−b
−
√D/
2a
=
−
(
−7
)
−1/
2·3
=
6/6
=
1
ответ
1 votes
Thanks 1
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Answers & Comments
Вычислим дискриминант:
D=b²−4ac=(−7)²−4·3·4=49−48=1
Вычислим корни:
х₁=−b+√D/2a=−(−7)+1/2·3=8/6=4/3
х₂=−b−√D/2a=−(−7)−1/2·3=6/6=1
ответ