[1+1/19988.12+5+31/753/2*(8+1997/1998)]/4+11/48

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[1+1/1998*8.12+5+31/75*3/2*(8+1997/1998)]/4+11/48
[1+1/1998*8.12+5+31/75*3/2*(8+1997/1998)]/4+11/48

[1+1/1998*8.12+5+31/75*3/2*(8+1997/1998)]/4+11/48
=3.1251051051051.（循环）