bonjour
B = 4 -[ ( 1 - 1/3 + 1/4 ) : ( 1 + 1/3 - 1 /4 ) ]
B = 4 - ( 12/12 - 4/12 + 3/12 ) ; ( 12/12 + 4/12 - 3 /12 ) ]
B = 4 - ( 11/12 : 13/12 )
B = 4 - ( 11/12 x 12/13 )
B = 4 - 132/156
B = 4 - 11/13
B = 52/13 - 11 /13 = 41/13
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bonjour
B = 4 -[ ( 1 - 1/3 + 1/4 ) : ( 1 + 1/3 - 1 /4 ) ]
B = 4 - ( 12/12 - 4/12 + 3/12 ) ; ( 12/12 + 4/12 - 3 /12 ) ]
B = 4 - ( 11/12 : 13/12 )
B = 4 - ( 11/12 x 12/13 )
B = 4 - 132/156
B = 4 - 11/13
B = 52/13 - 11 /13 = 41/13