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29 Recopier et compléter les égalités.
1. (x + 4) x (x + 3) = XX... +xx... + 4 x ... + 4x
2. (X - 5)(x + 6) = xX... +xx... +(-5) x ... + (-5)
3. (x-7)(x-2)=xx... + xx ...+(-7x...+(-7)x.
(2x+3)(3x + 1)=2xx ... +2x x...............

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