Bonjour pouvez vous me faire ces calcul et démontrant bien tout les calculs merci.

A=3÷20-5÷4
B=(25÷12)×(16÷15)×(9÷4)
C=(24÷21)÷(18÷14)
D=(2÷7-1÷3)×7÷4-5÷4

Merci
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