(1+2/3)×(1- 2/3)×(1+2/5)×(1- 2/5)×...×(1+2/99)×(1- 2/99)=?
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(1+2/3)×(1-2/3)×(1+2/5)×(1-2/5)×...×(1+2/99)×(1-2/99)=?(1+2/3)×(1-2/3)×(1+2/5)×(1-2/5)×...×(1+2/99)×
(1+2/3)×(1- 2/3)×(1+2/5)×(1- 2/5)×...×(1+2/99)×(1- 2/99)=?
(1+2/3)×(1- 2/3)×(1+2/5)×(1- 2/5)×...×(1+2/99)×(1- 2/99)=?
(1+2/3)×(1- 2/3)×(1+2/5)×(1- 2/5)×...×(1+2/99)×(1- 2/99)=?
(1+2/3)×(1- 2/3)×(1+2/5)×(1- 2/5)×...×(1+2/99)×(1- 2/99)=[(5/3)*(7/5)*(9/7)*...*(101/99)]*[(1/3)*(3/5)*(5/7)*...(97/99)]=(101/3)*(1/99)=101/297
把题目括号中的数字算出来,找规律
原式=(5/3)*(1/3)*(7/5)*(3/5)*(9/7)*(5/7)*……*(101/99)*(97/99)
每相隔两项之积为1,到最后就剩下了:
(1/3)×(101/99)
=101/297
(-2/1)-(-3/1)-(-3/2)
(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、1、2、3、5、( )、( ).
(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)
(1/3m-1/2)^2
(1/1+2)+(1/1+2+3)+…+(1/1+2+3…+2000)
(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)
(1:2)/(2:3)=3:
-1/2+(-1/6)-(-1/4)-2/3
巧算(奥数题)问:(1+1/2)×(1-1/2)×(1+1/3)×(1-1/3)×...(1+1/99)×(1-1/99)
1-(2a-1)-3(3a-2)
200*(1-1/2)*(1-1/3)*(1-1/4)*.*(1-1/100)
2000*(1-1/2*)*(1-1/3)*...*(1-1999)*(1-1/2000)
1/1+1/(1+2)+1/(1+2+3)+.+1/(1+2+3+.+100)不用计算器
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)
数列 1+(1+2)+(1+2+3)+(1+2+3+4)+.+(1+2+3+...+2009)=?