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 ) (
-
) + (
+
) = (
-
) + (
+
) = -
+
= 