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Sagot :

A = 6x ² - 5 - (- 4 - 5x + 12x ² )
A = 6x ² - 5 + 4 + 5x - 12x ²
A = - 6x ² - 1 + 5x

B = 3x ² + (5 - 7x ² ) - (- 8 + 12x - 4x ² )
B = 3x ² + 5 - 7x ² + 8 - 12x + 4x ²
B = 13 - 12x

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