(1-2的2次方分之1)*(1-3的2次方分之1)*(1-4的2次方分之1)*…*(1-10的2次方分之1)
=(1-1/2)(1+1/2)(1-1/3)(1+1/3)(1-1/4)(1+1/4)...(1-1/9)(1+1/9)(1-1/10)(1+1/10)
=1/2×3/2×2/3×4/3×3/4×5/4×...×8/9×10/9×9/10×11/10
=1/2×11/10
=11/20
(1-2的2次方分之1)*(1-3的2次方分之1)*(1-4的2次方分之1)*…*(1-10的2次方分之1)
=(1-1/2)(1+1/2)(1-1/3)(1+1/3)(1-1/4)(1+1/4)...(1-1/9)(1+1/9)(1-1/10)(1+1/10)
=1/2×3/2×2/3×4/3×3/4×5/4×...×8/9×10/9×9/10×11/10
=1/2×11/10
=11/20