Bonsoire vous pouvez m aider svp ??.... Pergunta de ideia dekenzadu67

kenzadu67 @kenzadu67

January 2021 1 100 Report

Bonsoire vous pouvez m aider svp ??

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trudelmichel

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Bonjour,
f(x)=-x^(3)+3x
x=-3 f(-3)=-(-3)^3+3(-3) f(-3)= -(-27)-9 f(-3)=27-9 f(-3)=18
x=-1 f(-1)=-(-1^3)+3(-1) f(-1)= -(-1)-3 f(-1)=1-3 f(-1)=-2
x=1 f(1)= -(1^3)+3(1) f(1)= -1+3 f(1)=2
x=3 f(3)=-(3^3)+3(3) f(3)= -27+9 f(3)=18

MAX f(x)=18
MIN f(x)=-18

si 1≤x≤3 alors f(3)≤f(x)≤f(1)
si x ∈[-3;3] alors f(x)∈[-18;18]

2 votes Thanks 1

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