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1999又1998/1999乘以2000
=(1999+1998/1999)×2000
=(2000-1+1998/1999)×2000
=(2000-1/19999)×2000
=2000×2000-1/1999×2000
=2000²-1/1999×(1999+1)
=2000²-1-1/1999
=4000000-1-1/1999
=3999998+2-1-1/1999
=3999998+1998/1999
=3999998又1998/1999
=(1999+1998/1999)×2000
=(2000-1+1998/1999)×2000
=(2000-1/19999)×2000
=2000×2000-1/1999×2000
=2000²-1/1999×(1999+1)
=2000²-1-1/1999
=4000000-1-1/1999
=3999998+2-1-1/1999
=3999998+1998/1999
=3999998又1998/1999
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