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Ex. 6 :

1) a) 8, 16, 24, 32, 40, 48, 56, 64 et 72

   b) 18, 36, 54, 72, 90, 108, 126, 144 et 162

   c) 72

2) 3/8 - 5/18 = (3×9)/(8×9) - (5×4)/(18×4) =  27/72 - 20/72 = 7/72

   -5/8 - 1/18 = (-5×9)/(8×9) - (1×4)/(18×4) = -45/72 - 4/72 = -49/72

   

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