[whatshix]

$\frac{1}{127} = \frac{1}{127}\times\frac{1+127}{1+127} = \frac{1+127}{127\times128} = \frac{1}{127\times128} + \frac{127}{127\times128} = \frac{1}{16,256} + \frac{1}{128}$

ดังนั้น A+B = 16,256+128 = 16,384