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MAUDMARINE

Bonjour

2/3+5/9  = (2 x 3) / (3 x 3) + 5/9 = 6/9 + 5/9 = 11/9

8/3x9/2  = 72/6 = (6 x 12) / (6 x 1) = 12

5x3/4  = 15/4

14/15-2/3  = 14/15 - (2 x 5) / (3 x 5) = 14/15 - 10/15 = 4/15

3/4:9/5 = 3/4 x 5/9 = 12/36 = (12 x 1) / (12 x 3) = 1/3.

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