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13/8 + 4=?


10 - 9/8=?

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SEPT77

Réponse:

13/8 + 4= 13/8 + 4×8/1×8 = 13/8 + 32/8 = 45/8

10 - 9/8= 10×8/1×8 - 9/8 = 80/8 - 9/8 = 71/8

MAUDMARINE

Bonjour

13/8 + 4 = 13/8 + (4 x 8) / (1 x 8) = 13/8 + 32/8 = 45/8

10 - 9/8= (10 x 8) / (1 x 8) - 9/8 = 80/8 - 9/8 = 71/8