Vous pouvez m'aider pour les équations suivantes: 1) 5-(x-3)=4x(3x-8) 2) 2+x(5+2x)-7=3x+7 3) 4x+3-(×.... Pergunta de ideia deJustwork

May 2019 1 49 Report

Vous pouvez m'aider pour les équations suivantes:
1) 5-(x-3)=4x(3x-8)
2) 2+x(5+2x)-7=3x+7
3) 4x+3-(×+1)+5=5x+7
4) 2x+1-(2+x)-7=3x+7
5) 5(x-1)+3(2-x)=0
6) 7(x+4)-3(x+2)=x+7
7) 2(x-1)-3(x+1)=4(x-2)

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loulakar

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Bonsoir,

1) $5-(x-3)=4x(3x-8)$
$5 - x + 3 = 12x^{2} - 32x$
$8 - x = 12x^{2} - 32x$
$12x^{2} - 32x + x - 8 = 0$
$12x^{2} - 31x - 8 = 0$

2) $2+x(5+2x)-7=3x+7$
$2 + 5x + 2x^{2} - 7 = 3x + 7$
$2x^{2} + 5x - 3x - 5 - 7 = 0$
$2x^{2} + 2x - 12 = 0$
$2(x^{2} + x - 6) = 0$

3) $4x+3-(x+1)+5=5x+7$
$4x + 3 - x - 1 + 5 = 5x + 7$
$3x + 7 = 5x + 7$
$5x - 3x = 7 - 7$
$2x = 0$
$x = 0$

4) $2x+1-(2+x)-7=3x+7$
$2x + 1 - 2 - x - 7 = 3x + 7$
$x - 8 = 3x + 7$
$3x - x = - 8 - 7$
$2x = -15$
$x = \frac{-15}{2}$

5) $5(x-1)+3(2-x)=0$
$5x - 5 + 6 - 3x = 0$
$2x = -1$
$x = \frac{-1}{2}$

6) $7(x+4)-3(x+2)=x+7$
$7x + 28 - 3x - 6 = x + 7$
$4x + 22 = x + 7$
$4x - x = 7 - 22$
$3x = -15$
$x = \frac{-15}{3}$
$x = -5$

7) $2(x-1)-3(x+1)=4(x-2)$
$2x - 2 - 3x - 3 = 4x - 8$
$-x - 5 = 4x - 8$
$4x + x = 8 - 5$
$5x = 3$
$x = \frac{3}{5}$

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