Odpowiedzi

2010-02-25T16:44:17+01:00
Abc-(abc-(-xyz-(xyz-abc)))=
=abc-(abc-(-xyz-xyz+abc))=
=abc-(abc+xyz+xyz-abc)=
=abc-abc-xyz-xyz+abc=
=abc - 2xyz
2010-02-25T16:44:35+01:00
Abc-(abc-(-xyz-(xyz-abc))) =
=abc - (abc-(-xyz-xyz+abc))=
=abc-(abc+xyz+xyz-abc)=
=abc - abc- xyz-xyz +abc=
=-2xyz+abc