(1+1/2)*(1+1/4)*(1+1/6)*(1-1/3)*(1-1/5)*(1-1/7)
=3/2*5/4*7/6*2/3*4/5*6/7
=1那1加2分之1乘1加4分之1乘……1加2012分之1乘1减3分之1乘1减去5分之一……乘1减2013分之1呢？急用！！(1+1/2)*(1+1/4)*...*(1+1/2012)*(1-1/3)*(1-1/5)*...*(1-1/2013)=3/2*5/4*7/6*...*2013/2012*2/3*4/5*...*2012/2013=1