21- Groupez les termes deux par deux en conservant l'ordre de ces termes. Exemple: 2a-3b-4c+5+2d-2x = (2a - 3b) - (4c - 5) + (2d - 2x) a) 2x - 5y - 8x + 11y - 4x -y b) -3x2 - 2x + 4x - 7x2-x-x2 c) 6A-2B-4C + 2A-5C + F d)2x-3y - 3z + 4xy + 2xz - 7x 44​
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