Exo 1
a ) + = + = =
b ) - = - = = =
c ) + = + = =
d ) + + = + + = =
e ) + 3 = + = + =
f ) 4 - = - = - =
g ) ( - ) + ( + ) = ( - ) + ( + ) = - + =
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Exo 1
a )
+ 
= 
+ 
= 
= 
b )
- 
= 
- 
= 
= 
= 
c )
+ 
= 
+ 
= 
= 
d )
+ 
+ 
= 
+ 
+ 
= 
= 
e )
+ 3 = 
+ 
= 
+ 
= 
f ) 4 -
= 
- 
= 
- 
= 
g ) (
- 
) + ( 
+ 
) = ( 
- 
) + ( 
+ 
) = - 
+ 
= 