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Sagot :

n°23 :
A= 3/7+5/2 = 6/14 + 35/14 = 41/14
B= -5/3+7/8 = -40/24 + 21/24 = -19/24
C= -8/5-5/3 = -24/15 - 25/15 = -49/15
D= 1/9-(-7/4) = 4/36 - -63/36 = 67/36

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