*已知t与x,求y
g y=1
replace y=x*y[_n-1] in 2/l
t x y
1978 1.1167 1
1979 1.07573 1.075729
1980 1.07841 1.160081
1981 1.05243 1.220906
1982 1.09057 1.331481
1983 1.10853 1.475987
1984 1.15176 1.699983
1985 1.13466 1.928906
1986 1.08846 2.099544
1987 1.11583 2.34274
1988 1.11281 2.607015
1989 1.04063 2.712943
1990 1.03839 2.817093
1991 1.09179 3.075673
1992 1.14241 3.51367
1993 1.13964 4.00433
1994 1.13081 4.528124
1995 1.10925 5.02282
1996 1.10009 5.525531
1997 1.09297 6.039241
1998 1.07833 6.512315
1999 1.0762 7.008543
2000 1.08431 7.599453
2001 1.083 8.230231
2002 1.09082 8.977706
2003 1.10025 9.877754
2004 1.10085 10.87393
2005 1.10433 12.00838
2006 1.116 13.40135
2007 1.13 15.14353
2008 1.09 16.50644
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