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Sagot :

A  =  (4/5 ÷ 2/3) × (1/2 − 3/4)
    =  (4/5 × 3/2) × (2/4 − 3/4)
    =  12/10 × (2 − 3)/4
    =  6/5 × (-1/4)
    =  -6/20
    =  -3/10

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