(1+1/1999+1/2000)*(1/1999+1/2000+1/2001+1/2002)-(1+1/1999+1/2000+1/2001+1/2002)*(1/1999+1/2000+1/2001) 用简便方法计算1/2001)
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1999÷1999/1999/2000+1/2001
2000-1999+1998.+2-1
(1+1/1998+1/1999)*(1/1998+1/1999+1/2000)-(1+1/1998+1/1999+1/2000
计算|1/2001|-1/2000+|1/2000-1/1999|-|1/1999-1/2001|
1999除以1999又1999/2000加1/2001 简算
1999÷1999又1999/2000+1/2001
用简便计算法:(1)1999×1999+2000+1999;
1999/1999又1999/2000+1/2001要简便算法
1/(1996*1997)+1/(1997*1998)+1/(1998*1999)+1/(1999*2000)+1/2000
2000*(1-1/2)*(1-1/3)*.*(1-1/1999)*(1-1/2000)
(1+1/1999+1/2000)*(1/1999+1/2000+1/2001+1/2002)-(1+1/1999+1/2000+1/2001+1/2002)*(1/1999+1/2000+1/2001) 用简便方法计算1/2001)
1^1999+2^1999+~~~+2000^1999能被1+2+~~~+2000整除
(1+1/1999+1/2000+1/2001)×(1/1999+1/2000+1/2001+1/2002)用简单点的方法
1/1×2+1/2×3+1/3×4+...+1/1998×1999+1/1999×2000
1/1*2+1/2*3+1/3*4+.+1/1998*1999+1/1999*2000
2000*(1-1/2*)*(1-1/3)*...*(1-1999)*(1-1/2000)
1+2+3+...+1999+2000+2001+2002
1+2 +3+ +1998+1999+2000=?