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Manon992903
@Manon992903
April 2019
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Bonjour, pour mardi, j'ai un dm de maths (3eme), et y'a un exercice que j'ai copmris, mais je suis pas sûre du résultat:
Consigne
:
Développer et réduire:
B= (9 - 7√3) ²
= 81 - 49 x 3
= 81 - 147
= -66
Est-ce que j'ai bon ?
merci d'avance ! :)
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winner123
Verified answer
Bonjour
B= (9 - 7√3) ²
81 - 126√3 + 147
228 -126√3
0 votes
Thanks 0
Manon992903
Pourquoi 126√3 + 147 ?
jennyf
B= (9 - 7√3) ²
B=9²-2*9*7
√3+(7√3)²
B=81-126√3+147
B=228-126√3
1 votes
Thanks 1
jennyf
(a-b)²=a²-2ab+b²
Manon992903
Ah ! ça ! J'avais oublié ! Merci beaucoup :)
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Verified answer
BonjourB= (9 - 7√3) ²
81 - 126√3 + 147
228 -126√3
B=9²-2*9*7√3+(7√3)²
B=81-126√3+147
B=228-126√3