(1/1×2)+(1/2×3)+(1/3×4)+…+(1/2010×2011)+(1/2012×2013)的值.(提示:1/1×2=1-1/2;1/2×3=1/2-1/3)
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(1/1×2)+(1/2×3)+(1/3×4)+…+(1/2010×2011)+(1/2012×2013)的值.(提示:1/1×2=1-1/2;1/2×3=1/2-1/3)(1/1×2)+(1/2×3
(1/1×2)+(1/2×3)+(1/3×4)+…+(1/2010×2011)+(1/2012×2013)的值.(提示:1/1×2=1-1/2;1/2×3=1/2-1/3)
(1/1×2)+(1/2×3)+(1/3×4)+…+(1/2010×2011)+(1/2012×2013)的值.(提示:1/1×2=1-1/2;1/2×3=1/2-1/3)
(1/1×2)+(1/2×3)+(1/3×4)+…+(1/2010×2011)+(1/2012×2013)的值.(提示:1/1×2=1-1/2;1/2×3=1/2-1/3)
很久没做数学题了……格式你自己写
=(1-1/2)+(1/2-1/3)+(1/3-1/4)……+(1/2012-1/2013)
=1-1/2013
=2012/2013
(1/2+1/3+...+1/2004)(1+1/2+1/3+...+1/2003)-(1+1/2+1/3+...+1/2004)(1/2+1/3+...+1/2003)
(1-1/2^2)(1-1/3^2)K(1-1/10^2)
(1-1/2^2)(1-1/3^2)K(1-1/10^2)
(1/2+1/3+...+1/2007)*(1+1/2+1/3+...+1/2006)-(1+1/2+1/3+...+/2007)*(1/2+1/3+...+1/2006)
(1/1+2)+(1/1+2+3)+…+(1/1+2+3…+2000)
200*(1-1/2)*(1-1/3)*(1-1/4)*.*(1-1/100)
1、1、2、3、5、( )、( ).
计算:(1/2+1/3+...+1/2011)*(1+1/2+1/3+...+1/2010)-(1+1/2+1/3+...+1/2011)*(1/2+1/3+...+1/2010)
计算(1-1/2-1/3-...-1/2010)*(1/2+1/3+..+1/2011)-(1-1/2-1/3-...-1/2011)*(1/2+1/3+...+1/2010)
计算:(-1)-[1-(1-1/2*1/3)]*6
计算!(-1)-[1-(1-1/2*1/3)]*6
(1/3m-1/2)^2
巧算(奥数题)问:(1+1/2)×(1-1/2)×(1+1/3)×(1-1/3)×...(1+1/99)×(1-1/99)
2000*(1-1/2*)*(1-1/3)*...*(1-1999)*(1-1/2000)
(-2/1)-(-3/1)-(-3/2)
(1-2/1)*(1-3/1)*(1-4/1)*.*(1-2007/1)*(1-2008/1)
(1/2014-1)(1/2013-1)(1-2012-1)...(1/3-1)(1/2-1)
1/1+1/(1+2)+1/(1+2+3)+.+1/(1+2+3+.+100)不用计算器