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Sagot :

Bonjour,

a) 13/30+5/30-24/30=

18/30 -24/30=

-6/30 = -1/5

b)49/18-9/18-(-5/18)

49/18 -9/18 +5/18=

40/18 +5/18 =

45/18 = 5/2

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