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Muradli2000
@Muradli2000
August 2021
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Очень очень сильно прошу помогите срочно 4 5 6
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ТатМих
Verified answer
4)
3х²-5х-4=0
x1+x2=5/3
x1*x2=-4/3
x1²x2+x1x2²=x1*x2(x1+x2)=5/3*(-4/3)=-20/9=-2 2/9
C(-2 2/9)
5)
kx²+px+5=0
x1=-3
x2=-2
x+x2=-p/k=-5
x1*x2=5/k=6
p/k=5 p=5k
5/k=6 ⇒k=5/6⇒⇒p=25/6=4 1/6
A(p=4 1/6;k=5/6)
6)
0.8-0.4x≠0
0.8-0.4x>0
0.4x<0.8
x<2
B(-бесконечность;2)
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Muradli2000
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Answers & Comments
Verified answer
4)3х²-5х-4=0
x1+x2=5/3
x1*x2=-4/3
x1²x2+x1x2²=x1*x2(x1+x2)=5/3*(-4/3)=-20/9=-2 2/9
C(-2 2/9)
5)
kx²+px+5=0
x1=-3
x2=-2
x+x2=-p/k=-5
x1*x2=5/k=6
p/k=5 p=5k
5/k=6 ⇒k=5/6⇒⇒p=25/6=4 1/6
A(p=4 1/6;k=5/6)
6)
0.8-0.4x≠0
0.8-0.4x>0
0.4x<0.8
x<2
B(-бесконечность;2)