(1/3+1/4……+1/2006)(1/2+1/3……+1/2006)-(1/2+1/3+……+1/2006)(1/3+1/4……+1/2005)
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(1/3+1/4……+1/2006)(1/2+1/3……+1/2006)-(1/2+1/3+……+1/2006)(1/3+1/4……+1/2005)
(1/2+1/3+1/4+1/5+……+1/2007)*(1+1/2+1/3+1/4+……+1/2006)………………计算:(1/2+1/3+1/4+1/5+……+1/2007)*(1+1/2+1/3+1/4+……+1/2006)-(1+1/2+1/3+1/4+……+1/2007)*(1/2+1/3+1/4+^+1/2006)要求简算
1-2+3-4……+2005-2006
(-1)+(+2)+(-3)+(+4)+……+(-2005)+(+2006)+(-2007)+(+2008)
(+1)+(-2)+(+3)+(-4)+……+(+2005)+(-2006)+2007
计算 |2/1-3/1|+|3/1-4/1|+|4/1-5/1|+……+|2006/1-2007/1|
计算 |2/1-3/1|+|3/1-4/1|+|4/1-5/1|+……+|2006/1-2007/1|
计算:(1/2+1/3+1/4+…+1//2006)(1+1/2+1/3+…+1/2005)-(1+1/2+1/3+1/4+…+1/2006)(1/2+1/3+…+1/2005)
1×1/2+1/2×1/3+1/3×1/4……+1/2005×1/2006=?
(2006-1/2-1/3-……-1/2005)(1/2+1/3+……+1/2006)-(2006-1/2-1/3-……-1/2006)(1/2+1/3……+1/2005)=?
1/2+(1/3+2/3)+(1/4+2/4+3/4)+…(1/2006+2/2006+3/2006+…+2005/2006)=?1/2+〔1/3+2/3〕+〔1/4+2/4+3/4〕+…+〔1/2006+2/2006+…+2004/2006+2005/2006〕=0.5+1+1.5+.1003=2006*(0.5+1003)/2=1006510.
1+2+3+4+···+2005+2006)/(1-1/1004)*(1-1/1005)……(1-1/2005)*(1-1/2006)=
一道初中计算题,(用简便方法计算)急~(1/2+1/3+1/4+……+1/2007)*(1+1/2+1/3+1/4+……+1/2006)-(1+1/2+1/3+1/4+……+1/2007)*(1/2+1/3+1/4+……+1/2006)=
来问一道简便运算(1+1/2)(1+1/3)(1+1/4)……(1+1/2005)(1/2-1)(1/3-1)(1/4-1)……(1/2006-1)
1+2-3-4+5…+2005+2006-2007-2008
(+1)+(-2)+(+3)+(-4)+…+(+2005)+(-2006)+2007怎么做?
(1+1/2)(1+1/3)(1+1/4)(1+1/5)……(1+1/2005)(1+1/2006)=?
计算(1+1/1×3)(1+1/2×4)(1+1/3×5)……(1+1/2006×2008)(1+1/2007×2009)急~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~