4/1+8/1+16/1+32/1+64/1+128/1=?是4/1开头,不是2/1
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![4/1+8/1+16/1+32/1+64/1+128/1=?是4/1开头,不是2/1](/uploads/image/z/642964-4-4.jpg?t=4%2F1%2B8%2F1%2B16%2F1%2B32%2F1%2B64%2F1%2B128%2F1%3D%3F%E6%98%AF4%2F1%E5%BC%80%E5%A4%B4%2C%E4%B8%8D%E6%98%AF2%2F1)
4/1+8/1+16/1+32/1+64/1+128/1=?是4/1开头,不是2/1
4/1+8/1+16/1+32/1+64/1+128/1=?
是4/1开头,不是2/1
4/1+8/1+16/1+32/1+64/1+128/1=?是4/1开头,不是2/1
4/1+8/1+16/1+32/1+64/1+128/1
=1/4×[1-(1/2)^6)/(1-1/2)
=1/2×63/64
=63/128
252
63/128
用1/2去减下一个数,一直减下去。你试试。就出来了。