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Oneesan
@Oneesan
April 2019
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SVP Urgent ! Exercice de DM: Résoudre les équations suivantes
1)
2)
3)
4)
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Omnes
Salut,
x² + 13 = 48
x² = 48 - 13
x² = 35
x² - 35 = 0
(x+
)(x-
) = 0
x -
= 0
x =
x +
= 0
x = -
7x² - 11 = 3x² + 13
7x² -3x² = 13 +11
4x² = 24
4x² - 24 = 0
(2x -
)(2x+
) = 0
2x -
= 0
2x =
x =
2x+
= 0
2x = -
x = -
(5x-2)² = 36
(5x-2)² - 36 = 0
(5x-2+6)(5x-2-6) = 0
(5x +4)(5x-8) = 0
5x + 4 = 0
5x = -4
x = -4/5
5x - 8 = 0
5x = 8
x = 8/5
(3x+2)² = (5x-4)²
(3x+2)² - (5x-4)² = 0
[(3x + 2) - (5x-4)][(3x+2)+(5x-4)] = 0
(3x+2-5x+4)(3x+2+5x-4) = 0
(8x + 6)(8x -2) = 0
2(4x+3)(8x-2) = 0
4(4x+3)(4x-1) = 0
4x + 3 = 0
4x = -3
x = -3/4
4x - 1 = 0
4x = 1
x = 1/4
Bonne soirée !
1 votes
Thanks 2
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Lista de comentários
x² + 13 = 48
x² = 48 - 13
x² = 35
x² - 35 = 0
(x+)(x-) = 0
x - = 0
x =
x + = 0
x = -
7x² - 11 = 3x² + 13
7x² -3x² = 13 +11
4x² = 24
4x² - 24 = 0
(2x - )(2x+) = 0
2x - = 0
2x =
x =
2x+ = 0
2x = -
x = -
(5x-2)² = 36
(5x-2)² - 36 = 0
(5x-2+6)(5x-2-6) = 0
(5x +4)(5x-8) = 0
5x + 4 = 0
5x = -4
x = -4/5
5x - 8 = 0
5x = 8
x = 8/5
(3x+2)² = (5x-4)²
(3x+2)² - (5x-4)² = 0
[(3x + 2) - (5x-4)][(3x+2)+(5x-4)] = 0
(3x+2-5x+4)(3x+2+5x-4) = 0
(8x + 6)(8x -2) = 0
2(4x+3)(8x-2) = 0
4(4x+3)(4x-1) = 0
4x + 3 = 0
4x = -3
x = -3/4
4x - 1 = 0
4x = 1
x = 1/4
Bonne soirée !