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Tnbh
@Tnbh
January 2021
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[3e] Bonjour, je n'arrive pas à faire mon dm de maths que je dois absolument avoir fini ce soir, je suis en 3ème pouvez-vous m'aider?
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trudelmichel
Verified answer
Bonjour,
calculons les dimensions de EFGH
EF=X-2
AIRE ABCD=X²
AIRE EFGH=(x-2)²=x²-4x+4
AIRE GRISE= A(ABCD)-A(EFGH)=x²-(x²-4x+4)=x²-x²+4x-4=4x-4=4(x-1)
Si Aire grise+20cm²
alors
4(x-1)=20
x-1=20/4
x-1=5
x=5+1
x=6
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Verified answer
Bonjour,calculons les dimensions de EFGH
EF=X-2
AIRE ABCD=X²
AIRE EFGH=(x-2)²=x²-4x+4
AIRE GRISE= A(ABCD)-A(EFGH)=x²-(x²-4x+4)=x²-x²+4x-4=4x-4=4(x-1)
Si Aire grise+20cm²
alors
4(x-1)=20
x-1=20/4
x-1=5
x=5+1
x=6