回答:
#y = 9x ^ 3-9x ^ 2 + 5x-5#
説明:
#色(白)(aaaaaaaaaaaaaaa)##9x ^ 2 + 5#
#色(白)(aaaaaaaaaaaaaaa)##x-1#
#色(白)(aaaaaaaaaaaaaaa)##---#
#色(白)(aaaaaaaaaaaaaaa)##9x ^ 3 + 5x#
#色(白)(aaaaaaaaaaaaaaaa)##-9x ^ 2-5#
#色(白)(aaaaaaaaaaaaaaaa)##-----#
#色(白)(aaaaaaaaaaaaaaa)##9x ^ 3-9x ^ 2 + 5x-5#