(1+1/2)*(1+1/4)*(1+1/6)*(1+1/8)*(1+1/10)*(1-1/3)*(1-1/5)*(1-1/7)*(1-1/9)
(注:*是乘,x/x是x分之x)
要过程!
(1+1/2)*(1+1/4)*(1+1/6)*(1+1/8)*(1+1/10)*(1-1/3)*(1-1/5)*(1-1/7)*(1-1/9)
(注:*是乘,x/x是x分之x)
要过程!
(1+1/2)*(1+1/4)*(1+1/6)*(1+1/8)*(1+1/10)*(1-1/3)*(1-1/5)*(1-1/7)*(1-1/9)
=3/2*5/4*7/6*9/8*11/10*2/3*4/5*6/7*8/9
=11/10=1.1
(1+1/2)*(1+1/4)*(1+1/6)*(1+1/8)*(1+1/10)*(1-1/3)*(1-1/5)*(1-1/7)*(1-1/9)
=(1+1/2)*(1-1/3)*(1+1/4)*(1-1/5)*(1+1/6)*(1-1/7)*(1+1/8)*(1-1/9)*(1+1/10)
=3/2*2/3*3/4*4/5*5/6*6/7*7/8*8/9*11/10
=11/10
=1.1
原式=3/2*5/4*7/6*9/8*11/10*2/3*4/5*6/7*8/9
=3/2*2/3*5/4*4/5*7/6*6/7*9/8*8/9*11/10
=11/10
=1.1