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Sagot :

bonjour

5/4*8/15-2/3=(5*8)/(4*15)-2/3=40/60-2/3=(40÷20)/(60÷20)-2/3=2/3-2/3=0

42/63-0-4/3=42/63-4/3=(42÷3)/(63÷3)=14/21-4/3=(7x2)/(7x3)-4/3=2/3-4/3=-2/3

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