=(1-1/2)(1+1/2)(1+1/2²)(1+1/2的4次方)(1+1/2的8次方)×2+1/2的15次方
=(1-1/2²)(1+1/2²)(1+1/2的4次方)(1+1/2的8次方)×2+1/2的15次方
=(1-1/2的4次方)(1+1/2的4次方)(1+1/2的8次方)×2+1/2的15次方
=(1-1/2的8次方)(1+1/2的8次方)×2+1/2的15次方
=(1-1/2的16次方)×2+1/2的15次方
=2-1/2的15次方+1/2的15次方
=2