2/1+4/2+8/3+16/4+32/5+64/6+128/7+256/8
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![2/1+4/2+8/3+16/4+32/5+64/6+128/7+256/8](/uploads/image/z/387567-63-7.jpg?t=2%2F1%2B4%2F2%2B8%2F3%2B16%2F4%2B32%2F5%2B64%2F6%2B128%2F7%2B256%2F8)
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2/1+4/2+8/3+16/4+32/5+64/6+128/7+256/8
2/1+4/2+8/3+16/4+32/5+64/6+128/7+256/8
2/1+4/2+8/3+16/4+32/5+64/6+128/7+256/8
请问是不是 二分之一+四分之二+……?
2/1=2
4/2=2
8/3=280/105
16/4=4
32/5=672/105
64/6=1120
128/7=1400/105
256/8=32
2+2+280/105+4+672/105+1120+1400/105+2
=40+3992/105