(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*······*(1+1/50)*(1-1/50)
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(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*······*(1+1/50)*(1-1/50)
(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*······*(1+1/50)*(1-1/50)
(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*······*(1+1/50)*(1-1/50)
用平方差
原式=(1-1/2)(1+1/2)(1-1/3)(1+1/3)……(1-1/50)(1+1/50)
=(1/2)(3/2)(2/3)(4/3)……(49/50)(51/50)
中间约分
=(1/2)(51/50)
=100分之51
原式= 3/2 * 1/2 * 4/3 * 2*3 ......50/49* 48/49 * 51/50 * 49/50
= 1/2 * 51/50
= 51/100
(1+1/2)(1+1/2^2)(1+1/2^4)(1+1/2^8)+1/2^15
(1/1000-1)×(1/999-1)×(1/998-1)×...×(1/2-1)
(1/50-1)*(1/49-1)*(1/48-1)*.*(1/2-1)
(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)
计算 ( 1+1/2)*(1-1/3)*(1+1/4)*(1-1/5)*.*(1+1/1000)*(1-1/1001)
(1+1/2)(1+1/2^2)(1+1/2^4)(1+1/2^8)+1/2^15=?
200*(1-1/2)*(1-1/3)*(1-1/4)*.*(1-1/100)
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
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2000*(1-1/2)*(1-1/3)*.*(1-1/1999)*(1-1/2000)
(1-1/2004)(1-2003)(1-2002)…(1-1/3)(1-1/2)
(1-1/2)(1-1/3)(1-1/4).(1-1/100)
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(1/2014-1)(1/2013-1)(1-2012-1)...(1/3-1)(1/2-1)
(1-1/2^2)(1-1/3^2)K(1-1/10^2)