Explications étape par étape:
1/9 - 1/6 = 6/36 - 9/36 = -3/36 = -1/12
7/12 + 5/18 = 21/36 + 10/36 = 31/36
-3 + 7/14 = -3 + 1/2 = -6/2 + 1/2 = -5/2
-6/20 - 8/16 = -3/10 -1/2 = -3/10 - 5/10 = -8/10 = -4/5
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Explications étape par étape:
1/9 - 1/6 = 6/36 - 9/36 = -3/36 = -1/12
7/12 + 5/18 = 21/36 + 10/36 = 31/36
-3 + 7/14 = -3 + 1/2 = -6/2 + 1/2 = -5/2
-6/20 - 8/16 = -3/10 -1/2 = -3/10 - 5/10 = -8/10 = -4/5