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Goudi
@Goudi
April 2019
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Bonjour, quel est le résultat de cette expression littérale :
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N² - (n+1)²+(n+2)²-2
=n²-n²+2n²-2
=0+2n²-2
=2n²-2
1 votes
Thanks 1
Goudi
Mais on ne peut enlever les signes que lorsqu'il s'agit de multiplication, non ?
peg05
ben il y a identité remarquable qui implique multiplication
peg05
N²-(n+1)²+(n+2)²-2
n²-(n²+2n+1)+(n²+4n+4)-2
n²-n²-2n-1+n²+4n+4-2
n²+2n+1
1 votes
Thanks 1
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=n²-n²+2n²-2
=0+2n²-2
=2n²-2
n²-(n²+2n+1)+(n²+4n+4)-2
n²-n²-2n-1+n²+4n+4-2
n²+2n+1