1+1\2+3\4+7\8+15\16+31\32+63\64+127\128等于多少?急用!
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1+1\2+3\4+7\8+15\16+31\32+63\64+127\128等于多少?急用!
1+1\2+3\4+7\8+15\16+31\32+63\64+127\128等于多少?急用!
1+1\2+3\4+7\8+15\16+31\32+63\64+127\128等于多少?急用!
原式=1+(1-1\2)+(1-1\4)+(1-1\8)+(1-1\16)+(1-1\32)+(1-1\64)+(1-1\128)
=1×8-(1\2+1\4+……+1\128)
=8-(1\2+1\4+……+1\128+1\128-1\128)
=8-(1\2+1\4+……+1\64+1\64-1\128)
=……
=8-(1\2+1\2-1\128)
=8-(1-1\128)
=7+1\128
=7又128分之1
1/2+3/4+7/8+15/16简算
1/2+3/4+7/8+15/16+...+1023/1024
1/2,-3/4,7/8,-15/16找规律
7/15*3/8+1/15*7/16+1/15*3又1/2
找规律算一算:已知2/1(/代表分数线)+4/1=4/3,4/3+8/1=8/7,8/7+16/1=16/15:2/1+4/1+8/1+16/1+32/1=().
15/8*[3/4-(7/16-1/4)]简便计算
8/15*[3/4-(7/16-1/4)]要简算
1+ 1/2 + 3/4 + 7/8 + 15/16简便计算,
1+1/2+3/4+7/8+15/16+.511/512
【1】(4/9+2/15)除以2/15 【2】13/16除以(7/8+3/16)
简算 2又5/8-(15/7-1又3/8 +1又8/15) 计算 1/2+1/4+1/8+1/16简算2又5/8-(15/7-1又3/8 +1又8/15)计算1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256
(1)3,5,7,9 (2)1/2,3/4,7/8,15/16,31/32 的通项公式
简算:7/15×3/8+1/15×7/16+7/2÷15
数字推理,期待高人1/9,1,7,36,( )3/15,1/3,3/7,1/2,( )1/16,2/13,2/5,8/7,4 ( )
7/15*3/8+1/15*7/16+1/15*3 1/2是3又2分之1
计算题 8/9×[15/16+(7/16-1/4)÷1/2] 15又3/14-2.25-7又3/4
1+2+5+4+3+9+6+7+8+15+16得多少?
1/2+3/4+7/8+15/16+31/32+63/64=?简便方法!