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Maevabelou
@Maevabelou
April 2019
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Calculer (3-5√2)×(7+2√2) donner la réponse sous forme: a+b√c
aidez moi svp
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kinzou2000
On a (3-5√2)×(7+2√2)
=3×7+3×2√2-5√2×7-5√2×2√2
=21+6√2-35√2-20
=1-29√2
donc (3-5√2)×(7+2√2) =1-29√2 =1+(-29√2)
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=3×7+3×2√2-5√2×7-5√2×2√2
=21+6√2-35√2-20
=1-29√2
donc (3-5√2)×(7+2√2) =1-29√2 =1+(-29√2)