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Sagot :


A= 5/12 + 13/12
= 15+13/12
= 28/12
A = 7/3

B= 16/3-3
= 16/3-9/3
= 16-9/3
B=7/3

C=2+3/4+7/2
= 8/4+3/4+14/4
= 8+3+14/4
C=25/4

D=15/8-(1/4+1/8)
= 15/8-(2+1/8)
= 15/8-3/8
D=3/2

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