Explications étape par étape:
3/4 + 5/8 = 6/8 + 5/8 = 11/8
4/5 - 2/3 = 12/15 - 10/15 = 2/15
20/9×21/25 = 4/3×7/5 = 28/15
7/4÷5/4 = 7/4×4/5 = 7/5
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Explications étape par étape:
3/4 + 5/8 = 6/8 + 5/8 = 11/8
4/5 - 2/3 = 12/15 - 10/15 = 2/15
20/9×21/25 = 4/3×7/5 = 28/15
7/4÷5/4 = 7/4×4/5 = 7/5