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Gabriel10
@Gabriel10
April 2019
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25x au carré=20x-4 (équation s'il vous palit merci)
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gianni191196gfr
La question a 2 solution -0.4 OK 0.4
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mimiemdr
25x² = 20x-4
25x² - 20x + 4 = 0
25x² - 10x - 10x + 4 = 0
5x(5x-2) 2(-5x+2) = 0
(5x-2)(5x+2) = 0
(5x)²-2² = 0
25x² - 4 = 0
25x² = 4
x² = 4/25
x = racine de 4/25
x = 2/5
2 votes
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25x² - 20x + 4 = 0
25x² - 10x - 10x + 4 = 0
5x(5x-2) 2(-5x+2) = 0
(5x-2)(5x+2) = 0
(5x)²-2² = 0
25x² - 4 = 0
25x² = 4
x² = 4/25
x = racine de 4/25
x = 2/5