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calcluer les opérations suivantes en prenant soin de detailler vos calculs et de simplifier les resultats si ceuxci le permattent 12/7:8/28+5/4-20/7+1=

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(12/7)/(8/28) + 5/4 - 20/7 + 1 = 

(12/7) / ( 2/7 ) + 5/4 - 20/7 + 1  =

( 12/7 ) * ( 7/2 ) + 5/4 - 20/7 + 1 =

12/2 + 5/4 - 20/7 + 1  =

6 + 1  + 5/4 - 20/7 =

7  + 5/4 - 20/7 =

196/28 - 80/28 + 5/4 =

116/28 + 5/4 =

116/28 + 35/28 =

151/28 

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