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6 Réduis chaque expression ci-dessous. N = 6r2 + 9 + 2x + 5 + 4x2 + 3 P = -1 + 5.r + 8x2 - 10.x - 3x2 - 7 R = 7 - x2 - 4x2 - 9x - 8 + 6x + 2x2

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