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Denisa2201
@Denisa2201
May 2022
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!!Помогите!! решите уравнения
[tex] 3x^{2}+5x-2=0 [/tex]
[tex] 2x^{2}-x-3=0 [/tex]
[tex] 9x^{2}-6x+1=0 [/tex]
[tex] 5x^{2}-8x-4=0 [/tex]
[tex] D=b^{2}+4ac [/tex]
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m11m
1) 3x² +5x-2=0
D=5²+4*3*(-2)=25-24=1
x₁=
-5-1
= -1
6
x₂ =
-5+1
=4/6 = 2/3
6
Ответ: -1; 2/3.
2) 2x² -x-3=0
D=(-1)² -4*2*(-3) =1+24=25
x₁=
1-5
= -1
4
x₂ =
1+5
= 6/4 =1.5
4
Ответ: -1; 1,5
3) 9х² -6x+1=0
(3x-1)² =0
3x-1=0
3x=1
x=1/3
Ответ: 1/3
4) 5x²-8x-4=0
D=(-8)² - 4*5*(-4) = 64 +80=144
x₁=
8 - 12
= -4/10 = -0.4
10
x₂=
8+12
= 2
10
Ответ: -0,4; 2.
1 votes
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Answers & Comments
D=5²+4*3*(-2)=25-24=1
x₁= -5-1 = -1
6
x₂ = -5+1 =4/6 = 2/3
6
Ответ: -1; 2/3.
2) 2x² -x-3=0
D=(-1)² -4*2*(-3) =1+24=25
x₁=1-5 = -1
4
x₂ = 1+5 = 6/4 =1.5
4
Ответ: -1; 1,5
3) 9х² -6x+1=0
(3x-1)² =0
3x-1=0
3x=1
x=1/3
Ответ: 1/3
4) 5x²-8x-4=0
D=(-8)² - 4*5*(-4) = 64 +80=144
x₁= 8 - 12 = -4/10 = -0.4
10
x₂= 8+12 = 2
10
Ответ: -0,4; 2.