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Sagot :

Bonsoir,

3/5 = (3*7)/(5*7) = 21/35

3/4 = (3*15)/ (4*15) = 45/60

80/100 = (80:20)/100:20) = 4/5

49/21 = (49: 7)/ (21:7) = 7/3

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