Bonjour,
1/2+1/3-1/4 =1*2/2*2-1/4+1/3
=2/4-1/4+1/3
=1/4+1/3
=1*3/4*3+1*4/3*4
=3/12+4/12
=7/12
(1/2+6/3)*1/2 =(3*1/2*3+6*2/3*2)*1/2
=(3/6+12/6)*1/2
=(15/6)*1/2
=15/6*2
=15/12
=5*3/4*3
=5/4
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Bonjour,
1/2+1/3-1/4 =1*2/2*2-1/4+1/3
=2/4-1/4+1/3
=1/4+1/3
=1*3/4*3+1*4/3*4
=3/12+4/12
=7/12
(1/2+6/3)*1/2 =(3*1/2*3+6*2/3*2)*1/2
=(3/6+12/6)*1/2
=(15/6)*1/2
=15/6*2
=15/12
=5*3/4*3
=5/4