マジックナンバー9
https://search.yahoo.co.jp/wrs/FOR=dVm_4OlV3iiTkPAwImJZAc2MeliV2YWVmAlHD145fOJrdZ0FEuVRs6zSizFxez.sv4UX7.loNVW01YOKPq6A_SP29EAfmF2IhjPus0tZid9SUwdh_IAE.Makwtf5gYy.Co4LQ8_OP.3FVzbZjfVtp0ArYtjrpumOSGElGCrJ_W.jbx_qQA8bZVYL3gc9BM2MYV4tCPDadv4rlQ5lZSHx43SGq58h6HU8ZEJMHmlutQHXoMmYTw--/_ylt=A7dPeggGXh5fJX8APB2DTwx.;_ylu=X3oDMTBtNHJhZXRnBHBvcwMxBHNlYwNzcgRzbGsDdGl0bGU-/SIG=16igi01hj/EXP=1595926470/**http%3A//www.konkougakuen.net/ssh%2520hp/2011Mat_27.pdf%23search=%27%25E3%2583%259E%25E3%2582%25B8%25E3%2583%2583%25E3%2582%25AF%25E3%2583%258A%25E3%2583%25B3%25E3%2583%2590%25E3%2583%25BC9%27

これとは別、hyogoのサイト
http://www.hyogo-c.ed.jp/~kenshusho/04kiyou/119pdf/119-3.pdf#search='%E9%AB%98%E6%A0%A1%E6%95%B0%E5%AD%A6+%E6%95%99%E5%85%B7'