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Sagot :

13/15-4/5*3/4 

 

= 13/15 - ( 4*3 / 15*4)

 

= 13/15 - 12/60

 

= (13*4 / 15*4) - 12/60

 

= 52/60 - 12/60

 

= (40/10 / 60/10)

 

= (4/2 / 6/2)

 

=2/3

 

J'espère t'avoir aidé ! :)

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