1.1/2+3/4+7/8+15/16+31/32+63/64+127/128+255/2562.(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*……*(1+1/99)*(1-1/99)
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1.1/2+3/4+7/8+15/16+31/32+63/64+127/128+255/2562.(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*……*(1+1/99)*(1-1/99
1.1/2+3/4+7/8+15/16+31/32+63/64+127/128+255/2562.(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*……*(1+1/99)*(1-1/99)
1.1/2+3/4+7/8+15/16+31/32+63/64+127/128+255/256
2.(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*……*(1+1/99)*(1-1/99)
1.1/2+3/4+7/8+15/16+31/32+63/64+127/128+255/2562.(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*……*(1+1/99)*(1-1/99)
1.
=1-1/2+1-1/4+1-1/8+...+1-1/256
=8-(1/2+1/4+1/8+...+1/256) 根据等比数列求和公式
=8-(1-1/256)
=7又1/256
2.
=3/2 * 1/2 * 4/3 * 2/3 * 5/4 * 3/4 * 6/5 * 4/5 *...*100/99 * 98/99
相隔其他两项的两项都消去了,如3/2和2/3,4/3和3/4
=1/2*100/99
=50/99
1.原式=(1-1/2)+(1-1/4)+(1-1/8)+(1-1/16)+(1-1/32)+(1-1/64)+(1-1/128)+(1-1/256)
=8-(1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256)
=8-(128+64+32+16+8+4+2+1)/256
=8-255/256
=7又1/256
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
-2,3,-4,-7,-8,15,-16,( ),( )
比大小:16/15、7/9、4/5、17/11、7/8、8/7、2/3
(1.1+1.1*1.1+1.1^3+1.1^4+...+1.1^n)=100,求n约等于多少,n取整数.已经7,8年没碰数学了,1.1*1.1=1.1^2
几道脱式计算(2、3题要用简便算法).1.1/16+1/2*5/8-1/4 2.24*(7/8+11/12) 3.7*5/6+1/6*7
【1】(4/9+2/15)除以2/15 【2】13/16除以(7/8+3/16)
分式数列1.1/4,2/7,2/5,8/13,1,()9/16,3,32/19,28/172.1,3,4,1,9,()5,11,14,64
15/8*[3/4-(7/16-1/4)]简便计算
8/15*[3/4-(7/16-1/4)]要简算
15/16,9/7,5/4,11/17,8/7,7/8,3/2从大到小排列是怎样的?
数字推理(要求详解)1.1,2,4,4,1,( )A.16 B.17 C.1/32 D.1/162.64,48,36,27,81/4,( )A.97/6 B.123/38 C.179/12 D.243/163.2-1,13+2,13+2,( )A.15-2 B.5-2 C.1 D.3-24.2+2,4+7,8+23,( )A.16+23 B.16+17 C.8+17 D.16
简算:7/15×3/8+1/15×7/16+7/2÷15
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!
2/1+4/3+8/7+16/15+32/31+64/63+.+128/127
1/2+3/4+7/8+15/16+.255/256=?