=（1-1/2）(1+1/2)(1+1/2的2次方)(1+1/2的4次方)(1+1/2的8次方)(1+1/2的16次方)/（1-1/2）+1/2的31次方
=（1-1/2的2次方）(1+1/2的2次方)(1+1/2的4次方)(1+1/2的8次方)(1+1/2的16次方)/（1-1/2）+1/2的31次方
=.
=（1-1/2的16次方)(1+1/2的16次方)/（1-1/2）+1/2的31次方
=（1-1/2的32次方）/（1/2）+1/2的31次方
=2-1/2的31次方+1/2的31次方
=2