作业帮｜1/2001-1/2000｜+｜1/2000-1/1999｜-｜1/1999-1/2001｜=?
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｜1/2001-1/2000｜+｜1/2000-1/1999｜-｜1/1999-1/2001｜=?
1/2+1/4+1/8+...+1/256+1/512+1/1024=?
1+2+3+...+1997+1998+1999=?
1/2+1/4+1/8+...+1/256+1/512+1/1024=?
1+2+3+...+1997+1998+1999=?
=1/2000-1/2001+1/1999-1/2000+1/2001-1/1999
=0
=1/2+1/4+1/8+...+1/256+1/512+1/1024+1/1024-1/1024
=1/2+1/4+1/8+...+1/256+1/512+1/512-1/1024
=...
=1-1/1024
=1023/1024
=(1+1999)*1999/2
=2000/2*1999
=1000*1999
=1999000
=0
=1/2+1/4+1/8+...+1/256+1/512+1/1024+1/1024-1/1024
=1/2+1/4+1/8+...+1/256+1/512+1/512-1/1024
=...
=1-1/1024
=1023/1024
=(1+1999)*1999/2
=2000/2*1999
=1000*1999
=1999000
1999÷1999/1999/2000+1/2001
1999/1999又1999/2000+1/2001
｜1/2001-1/2000｜+｜1/2000-1/1999｜-｜1/1999-1/2001｜=?
1999 2000/2001*1 2/1999
(1+1/1999+1/2000+1/2001)×（1/1999+1/2000+1/2001+1/2002)
|1/2001-1/2000|+|1/2000-1/1999|-|1/1999-1/2001|等于多少?
计算|1/2001|-1/2000+|1/2000-1/1999|-|1/1999-1/2001|
1999*1998/1+1999*2000/1+2000*2001/1+2001*2002/1+2002*2003/1+
1999÷1999又1999/2000+1/2001
1999除以1999又1999/2000加1/2001 简算
2002*2001-2001*2000+2000*1999-.-3*2+2*1
1+2+3+...+1999+2000+2001+2002