1)
1 - = - =
1 : = = 5
=============================================
2)
1 + = + =
1 : = =
========================================================
3)
1 : = = = 1
=======================================================
4)
4 - 3= 1
1 : 1 = 1 : = =
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Answers & Comments
1)
1 -
=
-
= 
1 :
=
= 5
=============================================
2)
1 +
=
+
= 
1 :
=
= 
========================================================
3)
1 -
=
-
= 
1 :
=
=
= 1
=======================================================
4)
4
- 3
= 1

1 : 1
= 1 :
=
=