1.6251991+19928/3-1992=

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1.625*1991+1992*8/3-1992=1.625*1991+1992*8/3-1992=1.625*1991+1992*8/3-1992=1.625*1991+1992*3/8-1992=

1.625*1991+1992*8/3-1992=
1.625*1991+1992*8/3-1992=

1.625*1991+1992*8/3-1992=
1.625*1991+1992*3/8-1992
= 1.625*1991-1992*(1-3/8)
=1.625*1991-1992*5/8
=1.625*1991-1991*5/8-5/8
=(1.625-5/8)*1991-5/8
=1991-5/8
=1990又3/8

1.625*1991+1992*3/8-1992
= 1.625*1991-1992*(1-3/8)
=1.625*1991-1992*5/8
=1.625*1991-1991*5/8-5/8
=(1.625-5/8)*1991-5/8
=1991-5/8
=1990又3/8