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Sagot :

1) 2×3 - 2×4

2) 25 × 2 - 49

   = 25 × 2 - 2 ×24,5

   = 2(25 - 24,5)

3) (2 + 3)(4 − 7) = 0

   =  5 × (-3) = 0

    =   -15 = 0

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