(-1999)*1999/2000

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(-1999)*1999/2000(-1999)*1999/2000(-1999)*1999/2000﹙﹣1999﹚×1999/2000=﹙﹣2000+1﹚×1999/2000=﹙﹣2000﹚×199

(-1999)*1999/2000
(-1999)*1999/2000

(-1999)*1999/2000
﹙﹣1999﹚×1999/2000
=﹙﹣2000+1﹚×1999/2000
=﹙﹣2000﹚×1999/2000+1×1999/2000
=﹣1999+1999/2000
=﹣1998又1/2000.

(-1999)*1999/2000
(-1999)*1999/2000
(-1999)*1999/2000
(-1999)*1999/2000
(-1999)*1999/2000
(-1999)*1999/2000

(-1999)*1999/2000
=-(2000-1)(2000-1)/2000
=-(2000-1)^2/2000
=-(2000^2-2*2000+1)/2000
=-(2000-2+1/2000)
=-(1998+1/2000)
=-1998又2000分之1