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Phospho
@Phospho
April 2019
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1) Développer et réduire :
D= (a+5)² - (a-5)²
2) On pose :
D= 10 005² - 9 995²
Sans utiliser la calculatrice, en se servant de la question 1 trouver la valeur de D (indiquer les étapes du calcul)
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maudefernandez
1 ) D = (a+5)² - (a-5)²
= a² + 10a + 25 - ( a² -10a + 25)
= a² + 10a + 25 - a² + 10a - 25
= 20a
2) D =
10 005² - 9 995²
= ( 10 000 + 5)
² - (10 000 - 5)²
Donc ici a = 10 000
Alors D = 20 x 10 000 = 200 000
1 votes
Thanks 2
maudefernandez
Oui
maudefernandez
j'ai vu
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Lista de comentários
= a² + 10a + 25 - ( a² -10a + 25)
= a² + 10a + 25 - a² + 10a - 25
= 20a
2) D = 10 005² - 9 995²
= ( 10 000 + 5)² - (10 000 - 5)²
Donc ici a = 10 000
Alors D = 20 x 10 000 = 200 000