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AlienKay
@AlienKay
July 2022
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Найдите произведение наименьшего и наибольшего значений функции:
[tex]f(x)= \frac{1}{3}x^3+x^2-8x[/tex] на отрезке [1;3].
Варианты ответов:
A) 48 B) -37 C)50 D) 56 E) -46
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sedinalana
Verified answer
F`(x)=1/3*3x²+2x-8=x²+2x-8=0
x1+x2=-2 U x1*x2=-8
x1=-4∉[1;3]
x2=2∈[1;3]
f(1)=1/3*1+1-8*1=1 1/3 -8=-6 2/3
f(2)=1/3*8+4-8*2=6 2/3-16=-9 1/3 наим
f(3)=1/3*27+9-8*3=9+9-24=-6 наиб
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Answers & Comments
Verified answer
F`(x)=1/3*3x²+2x-8=x²+2x-8=0x1+x2=-2 U x1*x2=-8
x1=-4∉[1;3]
x2=2∈[1;3]
f(1)=1/3*1+1-8*1=1 1/3 -8=-6 2/3
f(2)=1/3*8+4-8*2=6 2/3-16=-9 1/3 наим
f(3)=1/3*27+9-8*3=9+9-24=-6 наиб