Pouvez vous m'aider pour la 2ème questions svp on donne: A=2/5 - 1/4 et B=2/3 + 1/6

1) calculer A et B

A= 2×4/5×4 - 1×5/4×5
A= 8/20 - 5/20
A= 3/20

B=2×2/3×2 + 1/6
B= 4/6 + 1/6
B=5/6

2) calculer A+B
A-B
A/B

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