bonjour
B = ( 2/5 - 3/4 x 5/6) : ( 2/5 x 1 /4 + 1/3)
B = ( 2/5 - 15/24 ) : ( 2/20 + 1 /3)
B = ( 48/120 - 75/120) : ( 6/60 + 20/60 )
B = - 27/120 : 26/60
B = - 27/120 x 60/20
B = - 1 620 / 2 400
B = - 27/ 40
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bonjour
B = ( 2/5 - 3/4 x 5/6) : ( 2/5 x 1 /4 + 1/3)
B = ( 2/5 - 15/24 ) : ( 2/20 + 1 /3)
B = ( 48/120 - 75/120) : ( 6/60 + 20/60 )
B = - 27/120 : 26/60
B = - 27/120 x 60/20
B = - 1 620 / 2 400
B = - 27/ 40