Explications étape par étape:
7/8 ×8/7 = 56/56 = 1
-4 × -1/4 = 4/4 = 1
12×1/12 = 12/12 =1
-6/-13 × -13/-6 = 6/13×13/6 = 1
23 × 5/23 = 5
9) B, D, et E
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Explications étape par étape:
7/8 ×8/7 = 56/56 = 1
-4 × -1/4 = 4/4 = 1
12×1/12 = 12/12 =1
-6/-13 × -13/-6 = 6/13×13/6 = 1
23 × 5/23 = 5
9) B, D, et E