学霸们帮帮我吧
2个回答
2014-10-07
展开全部
1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256
=(1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256)*256\256
=(1/2*256+1/4*256+1/8*256+1/16*256+1/32*256+1/64*256+1/128*256+1/256*256)\256
=(128+64+32+16+8+4+2+1)\256
=255\256
=255/256
=(1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256)*256\256
=(1/2*256+1/4*256+1/8*256+1/16*256+1/32*256+1/64*256+1/128*256+1/256*256)\256
=(128+64+32+16+8+4+2+1)\256
=255\256
=255/256
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有点看不清
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