2016年7月9日土曜日

7月号-problem in July


新ブログ(姉妹ブログ)「gontanoe」公開中!
    https://gontanoe.muragon.com/


problem in July
 "Form a parabolic line with a ballpoint pen.Show how to do. If only it's parabolic line ,
any shape is OK.(being based on y=x²、y=2x²+5x+1,both are OK,I mean the line doesn't
depend on any formula.)