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seb53940
@seb53940
January 2021
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19 pts URGENT je n'y arrive pas du tout aidez moi s'il vous plait
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Amateur
Bonsoir,
1) Dom f=[0;6]
2)
AB=6,BC=8
AM=x==>MD=8-x
BN=x==>AN=6-x
Aire ABCD=6*8=48
Aire AMN=AM*AN/2=x*(6-x)/2=3x-x²/2
Aire MDC=MD*DC/2=(8-x)*6/2=24-3x
Aire CBN=BC*BN/2=x*8/2=4x
3)
Aire CMN=Aire ABCD-(Aire AMN+Aire MDC+Aire CBN)
=48-(3x-x²/2+4x+24-3x)=x²/2-4x+24=f(x)
5)
f(x)=x²/2-4x+24=1/2(x²-8x+48)
=1/2(x²-2*4*x+16+48-16)
=1/2((x-4)²+32) est minimum si x=4
et f(4)=1/2*32=16
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Lista de comentários
1) Dom f=[0;6]
2)
AB=6,BC=8
AM=x==>MD=8-x
BN=x==>AN=6-x
Aire ABCD=6*8=48
Aire AMN=AM*AN/2=x*(6-x)/2=3x-x²/2
Aire MDC=MD*DC/2=(8-x)*6/2=24-3x
Aire CBN=BC*BN/2=x*8/2=4x
3)
Aire CMN=Aire ABCD-(Aire AMN+Aire MDC+Aire CBN)
=48-(3x-x²/2+4x+24-3x)=x²/2-4x+24=f(x)
5)
f(x)=x²/2-4x+24=1/2(x²-8x+48)
=1/2(x²-2*4*x+16+48-16)
=1/2((x-4)²+32) est minimum si x=4
et f(4)=1/2*32=16