Explications étape par étape:
A = 5x + 4 - 2x - 3 = 3x + 1
B = 2x + 8 +4x - 7 = 6x + 1
C = 2x² + 8x - 4x² - 2x = -2x² + 6x
D = 8x - 2x - 6 = 6x - 6
E = 8x² - 2 -3x - 8 = 8x² - 3x - 10
F = 2x + 7 + 8x + 5 = 10x + 12
2)
A = 2x + 4 - 3x - 8 = -x - 4
B = 7x +8 - 9 - 3x = 4x - 1
C = 2x - 7 - 4x - 3 = -2x - 10
D = 7x + 8 - 4x + 5 = 3x + 13
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Explications étape par étape:
A = 5x + 4 - 2x - 3 = 3x + 1
B = 2x + 8 +4x - 7 = 6x + 1
C = 2x² + 8x - 4x² - 2x = -2x² + 6x
D = 8x - 2x - 6 = 6x - 6
E = 8x² - 2 -3x - 8 = 8x² - 3x - 10
F = 2x + 7 + 8x + 5 = 10x + 12
2)
A = 2x + 4 - 3x - 8 = -x - 4
B = 7x +8 - 9 - 3x = 4x - 1
C = 2x - 7 - 4x - 3 = -2x - 10
D = 7x + 8 - 4x + 5 = 3x + 13