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Tom2703
@Tom2703
April 2019
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Bonjour je suis en 3ème, je n'arrive pas à ce devoir, aidez-moi svp.
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winner123
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Bonsoir
-
Aire de RECT
(9x+4)(3x+2)
27x² +18x +12x +8 =
27x² +30x +8
pour x = 1 , aire = 65 cm²
-
Aire de GOIN
OG² = (6x+3)² - (3x +1)²
OG² = 36x² +36x +9 - ( 9x² +6x +1) = 36x² +36x +9 -9x² -6x -1 =
27x² +30x +8
pour x = 1 , aire = 65cm²
on constate que les 2 aires sont égales
OG² = (6x +3)² - (3x +1)²
(6x +3 +3x +1)(6x +3 -3x -1)
(9x +4)(3x +2)
2 votes
Thanks 1
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Verified answer
Bonsoir- Aire de RECT
(9x+4)(3x+2)
27x² +18x +12x +8 = 27x² +30x +8
pour x = 1 , aire = 65 cm²
- Aire de GOIN
OG² = (6x+3)² - (3x +1)²
OG² = 36x² +36x +9 - ( 9x² +6x +1) = 36x² +36x +9 -9x² -6x -1 = 27x² +30x +8
pour x = 1 , aire = 65cm²
on constate que les 2 aires sont égales
OG² = (6x +3)² - (3x +1)²
(6x +3 +3x +1)(6x +3 -3x -1)
(9x +4)(3x +2)