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Lina2612
@Lina2612
May 2019
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Je suis perdu aidez moi svppppp
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caylus
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Bonsoir,
1)
S(1)=(1+2)²-1²=3²-1=9-1=8
S(2)=(2+2)²-2²=16-4=12
S(3)=(3+2)²-3²=25-9=16
S(n)=(n+2)²-n²=((n+2)+n)((n+2)-n)=(2n+2)*2=4(n+1)
2a) oui car 4(n+1)=4n+4
3)
S(100)=4*(101)=404
S(50)=4*51=204.
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Lista de comentários
Verified answer
Bonsoir,1)
S(1)=(1+2)²-1²=3²-1=9-1=8
S(2)=(2+2)²-2²=16-4=12
S(3)=(3+2)²-3²=25-9=16
S(n)=(n+2)²-n²=((n+2)+n)((n+2)-n)=(2n+2)*2=4(n+1)
2a) oui car 4(n+1)=4n+4
3)
S(100)=4*(101)=404
S(50)=4*51=204.