1/2+1/4+1/8+1/16+1/32+1/64+1/128等于多少?一定要简算啊!别太复杂了,急,
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![1/2+1/4+1/8+1/16+1/32+1/64+1/128等于多少?一定要简算啊!别太复杂了,急,](/uploads/image/z/60575-23-5.jpg?t=1%2F2%2B1%2F4%2B1%2F8%2B1%2F16%2B1%2F32%2B1%2F64%2B1%2F128%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%3F%E4%B8%80%E5%AE%9A%E8%A6%81%E7%AE%80%E7%AE%97%E5%95%8A%21%E5%88%AB%E5%A4%AA%E5%A4%8D%E6%9D%82%E4%BA%86%2C%E6%80%A5%2C)
1/2+1/4+1/8+1/16+1/32+1/64+1/128等于多少?一定要简算啊!别太复杂了,急,
1/2+1/4+1/8+1/16+1/32+1/64+1/128等于多少?一定要简算啊!别太复杂了,急,
1/2+1/4+1/8+1/16+1/32+1/64+1/128等于多少?一定要简算啊!别太复杂了,急,
将原式加上 1/128,再减去 1/128得
1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/128-1/128
=1/2+1/4+1/8+1/16+1/32+1/64+1/64-1/128
=1/2+1/4+1/8+1/16+1/32+1/32-1/128
=.
=1-1/128
=127/128
64/128+32/128+16/128+8/128+4/128+2/128+1/128=127/128