1/2+3/4+7/8+15/16+31/32+63/64+127/128=多少
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解决时间 2021-01-06 08:29
- 提问者网友:蓝琪梦莎
- 2021-01-05 08:26
1/2+3/4+7/8+15/16+31/32+63/64+127/128=多少
最佳答案
- 五星知识达人网友:三千妖杀
- 2021-01-05 09:41
1/2+3/4+7/8+15/16+31/32+63/64+127/128
=7-(1/2+1/4+1/8+1/16+1/32+1/64+1/128)
=7-(1-1/128)
=7-1+1/128
=6又1/128
=7-(1/2+1/4+1/8+1/16+1/32+1/64+1/128)
=7-(1-1/128)
=7-1+1/128
=6又1/128
全部回答
- 1楼网友:话散在刀尖上
- 2021-01-05 11:06
原式=1-1/2+1-1/4+1-1/8+1-1/16+1-1/32+1-1/64+1-1/128
=7-(1/2+1/4+1/8+1/16+1/32+1/64+1/128)
=7-(1-1/128)=6+1/128
=7-(1/2+1/4+1/8+1/16+1/32+1/64+1/128)
=7-(1-1/128)=6+1/128
- 2楼网友:北方的南先生
- 2021-01-05 10:55
1/2+3/4+7/8+15/16+31/32+63/64+127/128
=1-1/2+1-1/4+1-1/8+1-1/16+1-1/32+1-1/64+1-1/128
=7-(1/2+1/4+1/8+1/16+1/32+1/64+1/128)
=7-1/2(1-(1/2)^7)/(1-1/2)
=7-1+(1/2)^7
=6+1/128
=1-1/2+1-1/4+1-1/8+1-1/16+1-1/32+1-1/64+1-1/128
=7-(1/2+1/4+1/8+1/16+1/32+1/64+1/128)
=7-1/2(1-(1/2)^7)/(1-1/2)
=7-1+(1/2)^7
=6+1/128
- 3楼网友:有你哪都是故乡
- 2021-01-05 10:25
a=1/2+3/4+7/8+15/16+31/32+63/64+127/128
b=1/2+1/4+1/8+1/16+ 1/32+ 1/64+ 1/128
那么a+b=7
b+1/128=1/2+1/4+1/8+1/16+ 1/32+ 1/64+ 1/128
=1/2+1/4+1/8+1/16+ 1/32+ 1/64+( 1/128+ 1/128)
=1/2+1/4+1/8+1/16+ 1/32+ (1/64+ 1/64)
=……
=1
所以b=1-1/128
a=8-b=7-(1-1/128)
=6+1/128
b=1/2+1/4+1/8+1/16+ 1/32+ 1/64+ 1/128
那么a+b=7
b+1/128=1/2+1/4+1/8+1/16+ 1/32+ 1/64+ 1/128
=1/2+1/4+1/8+1/16+ 1/32+ 1/64+( 1/128+ 1/128)
=1/2+1/4+1/8+1/16+ 1/32+ (1/64+ 1/64)
=……
=1
所以b=1-1/128
a=8-b=7-(1-1/128)
=6+1/128
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