Question

平方差计算(1+1/2)*(1+1/4)*(1+1/16)

Answer 1

(1+1/2)*(1+1/4)*(1+1/16)

=[(1-1/2)(1+1/2)*(1+1/4)*(1+1/16)]/(1-1/2)

=[(1-1/4)*(1+1/4)*(1+1/16)]*2

=[1-(1/16)^2]*2

=255/128