Bonjour,
A ) 1/2 - 1/3 + 1/4 -1/5 + 1/6
= 30/60 - 20/60 + 15/60 - 12/60 + 10/60
= 23/60.
B ) ( 4 - 2/3)( 2 - 4/3)
= ( 12/3 - 2/3 ) (6/3 - 4/3)
= 10/3 x 2/3
= 20/9
C ) 5/6 - 1/6 x 7 + 4/9
= 5/6 - 7/6 + 4/9
= 30/36 - 42/36 + 16/36
= 4/36
= 1/9
D ) ( 2 - 1/3 ) : 20/9
= ( 6/3 - 1/3 ) : 20/9
= 5/3 x 9/20
= 45/60
= 3/4
E ) - 5/3 - 4/3 x 7/8
= - 5/3 - 28/24
= - 40/24 - 28/24
= - 68/24
= - 17/6.
F ) ( 1 - 5/3 ) : ( 1 + 5/9 )
= ( 3/3 - 5/3 ) : ( 9/9 + 5/9 )
= - 2/3 : 14/9
= - 2/3 x 9/14
= - 18/42
= - 3/7.
Voilà, j'espère avoir pu t'aider.
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Bonjour,
A ) 1/2 - 1/3 + 1/4 -1/5 + 1/6
= 30/60 - 20/60 + 15/60 - 12/60 + 10/60
= 23/60.
B ) ( 4 - 2/3)( 2 - 4/3)
= ( 12/3 - 2/3 ) (6/3 - 4/3)
= 10/3 x 2/3
= 20/9
C ) 5/6 - 1/6 x 7 + 4/9
= 5/6 - 7/6 + 4/9
= 30/36 - 42/36 + 16/36
= 4/36
= 1/9
D ) ( 2 - 1/3 ) : 20/9
= ( 6/3 - 1/3 ) : 20/9
= 5/3 x 9/20
= 45/60
= 3/4
E ) - 5/3 - 4/3 x 7/8
= - 5/3 - 28/24
= - 40/24 - 28/24
= - 68/24
= - 17/6.
F ) ( 1 - 5/3 ) : ( 1 + 5/9 )
= ( 3/3 - 5/3 ) : ( 9/9 + 5/9 )
= - 2/3 : 14/9
= - 2/3 x 9/14
= - 18/42
= - 3/7.
Voilà, j'espère avoir pu t'aider.