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19 Simplifie chaque fraction. 2X3 X4 X5 18 × 5 × 6 a. C. 3 X4 X5 X7 3 x 2 x 2 x 3 11 x 15 x 17 x 7 18 × 15 b. d. 17 × 11 × 8 × 15 30 x 2