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elodie59185
@elodie59185
January 2021
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Pouvez vous m'aider pour la question 2 s'il vous plaît ?
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ramzi13
2) Un+1=2(n+1)²-(n+1)
=2(n²+2n+1)-(n+1)
=2n²+4n+2-n-1
=2n²+3n+1
Un-2=2(n-2)²-(n-2)
=2(n²-4n+4)-(n-2)
=2n²-8n+8-n+2
=2n²-9n+10
U2n=2(2n)²-(2n)
=2(4n²)-2n
=8n²-2n
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=2(n²+2n+1)-(n+1)
=2n²+4n+2-n-1
=2n²+3n+1
Un-2=2(n-2)²-(n-2)
=2(n²-4n+4)-(n-2)
=2n²-8n+8-n+2
=2n²-9n+10
U2n=2(2n)²-(2n)
=2(4n²)-2n
=8n²-2n