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prOphet
@prOphet
June 2021
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bonjour je ne réussi pas l'exercice à partir du petit 2 svp aider moi ç est urgent à rendre pour lundi
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soulehidriss
1)√500+3√5-3√45
√25×20+3√5-3√9×5
5√20+3√5-9√5
5√4×5+3√5-9√5
10√5+3√5-9√5
(10+3-9)√5
=4√5
⇔√180+3√80-2√125
√36×5+3√4×20-2√25×5
6√5+6√20-10√5
6√5+6√4×5-10√5
6√5+12√5-10√5
(6+12-10)√5
=8√5
2)A=2+
√6 ⇔B=1-√6
A²=(2+√6)²
=(2)²+2×√6×2+(√6)²
=4+4√6+6
=10+4√6
B²=(1-√6)²
=(1)²-2×√6+(√6)²
=1-2√6+6
=7-2√6
A×B=(2+√6)×(1-√6)
=2-2√6+√6-6
=2-√6-6
=4-√6
1 votes
Thanks 1
prOphet
vous pouviez m expliquer comment vous avez fait svp?
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prOphet
June 2021 | 0 Respostas
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prOphet
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prOphet
June 2021 | 0 Respostas
svp vous pouvait m aider pour l exercice 2 merci
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prOphet
June 2021 | 0 Respostas
bjr pouvait vous m aider svp c est urgent merci
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√25×20+3√5-3√9×5
5√20+3√5-9√5
5√4×5+3√5-9√5
10√5+3√5-9√5
(10+3-9)√5
=4√5
⇔√180+3√80-2√125
√36×5+3√4×20-2√25×5
6√5+6√20-10√5
6√5+6√4×5-10√5
6√5+12√5-10√5
(6+12-10)√5
=8√5
2)A=2+√6 ⇔B=1-√6
A²=(2+√6)²
=(2)²+2×√6×2+(√6)²
=4+4√6+6
=10+4√6
B²=(1-√6)²
=(1)²-2×√6+(√6)²
=1-2√6+6
=7-2√6
A×B=(2+√6)×(1-√6)
=2-2√6+√6-6
=2-√6-6
=4-√6