3/2+5/4+9/8+17/16+33/32+65/64+129/128=?

3/2+5/4+9/8+17/16+33/32+65/64+129/128=?
3/2+5/4+9/8+17/16+33/32+65/64+129/128=?

3/2+5/4+9/8+17/16+33/32+65/64+129/128=?
3/2+5/4+9/8+17/16+33/32+65/64+129/128
=1+1/2+1+1/4+...+1+1/128
=(1+1+...+1)+(1/2+1/4+...+1/128+1/128)-1/128
=7+1-1/128
=7又127/128

所有的分母化作128，通分求分子的和即可