gọi A=1/2+1/4+1/8+...+1/1024
2xA=1+1/2+1/4+.....+1/512
2xA-A=(1+1/2+1/4+....+1/512)-(1/2+1/4+1/8+...+1/1024)
A=1-1/1024
=1023/1024
vậy A=1023/1024
1/2+=1/4+1/8+1/16+...+1/512+1/1024
A = 1/2-1/4+1/8-1/16+1/32-................-1/1024+1/2048
C=1+2+4+8+16+32+....+512+1024
C=?
tính nhanh ;
1234.5678.(630 -315) :1996
319.45+ 55.319 /1995.1996 -1991.1995
1988.1996+1997.11+1985 /1997.1996-1995.1996
(1+2+4+8+.....+512) .(101.102-101.101-50-51) /2+4+6+8+16+....+1024+2048
(1+2+4+8+....+512).(135135.246-246246.135)/2+4+8+16+....+1024+2048
1.tính tổng
1+2+3+5+8+.....+55
1+4+16+.....+1024
giải bài toán sau
tính
S=1-1/2+1/4-1/8+1/16-...+1/1024
Chứng minh:1/2-1/4+1/8-1/16+1/32-1/64+1/128-1/256+1/512-1/1024<1/3
CM Bất đẳng thức:
a,A=1/2+1/4+1/8+...+1/1024 < 1/2
b,B= 1/+1/4+1/16+1/64+...+1/256 < 3/2
Tính nhanh :
\(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+...+\frac{1}{512}+\frac{1}{1024}\)
