This software is made for the purpose of acquiring the expanded result of "-2a5b4d-2a5b2d+20a4b2c+20a4b4c-2a3b2d-2a3b4d-2a3b3-2a3b+20a2b4c+20a2b2c-2ab3-2abh, when (20a2b2c-2a3b2d-2ab)(a2+1)(b2+1) is set. Accordingly this software is made for the purpose of acquiring an expansion of an equation. And the acquired equations can be added or expanded by files-works each other. The straight linefs equation passing several points on XY-plane or 3-dimension and having minimum distance were showed on the document of "About equation software".