Tính tổng S =1 + 2 + 4 + 8 + 16 + … + 8192 bằng bao nhiêu?
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Những câu hỏi liên quan
TN
6
HT
9 tháng 8 2015
A = 1+2+4+8+...+8192
A = 20 + 21 + 22 + 23 +...+213
2A = 21+22+23+24+...+214
2A - A = 214 - 20
=> A = 214 - 1
ND
3
16 tháng 1 2020
\(A=1+2+4+...+8192\)
\(=1+2+2^2+2^3+...+2^{13}\)
\(\Rightarrow2A=2+2^2+2^3+2^4+...+2^{13}+2^{14}\)
\(2A-A=2^{14}-1\)
\(A=2^{14}-1\)
Vậy A = 214 - 1.
DP
18 tháng 7 2017
\(A=1+2+4+8+16+...+8192\)
\(A=2^0+2^1+2^2+2^3+2^4+....+2^{13}\)
\(2A=2^1+2^2+2^3+2^4+....+2^{14}\)
\(2A-A=\left(2^1+2^2+2^3+2^4+...+2^{14}\right)-\left(2^0+2^1+2^2+2^3+2^4+...+2^{13}\right)\)
\(\Rightarrow A=2^{14}-1=16383\)
18 tháng 7 2017
2A=2+4+8+..+16384
=2^1+2^2+...+2^14
Suy ra 2A-A=A=2^14-1
=16384-1=16383
LV
1 tháng 2 2016
dãy trên có quy luật các số cách đều nhau 2 đơn vị tính số các số hạng rồi nhóm cặp số đầu số cuỗi
PT
2
9 tháng 9 2015
Đặt A = 1+2+4+..........+8192
A = \(2^0+2^1+......+2^{13}\)
2A = \(2+2^2+....+2^{14}\)
2A - A = \(\left(2-2\right)+\left(2^2-2^2\right)+......+\left(2^{13}-2^{13}\right)+2^{14}-1\)
A = \(2^{14}-1\)
26 tháng 11 2016
a﴿Tổng trên có:﴾100‐7﴿:3+1=32﴾số hạng﴿
b﴿Gọi số hạng thứ 22 cửa tổng trên là n
Theo đề bài ta có :
﴾n‐7﴿:3+1=22 ﴾n‐7﴿:3
=22‐1 ﴾n‐7﴿:3
=21 n‐7
=21.3 n‐7
=63 n
=63+7 n
=70 Vậy số hạng thứ 2 của tổng trên là 70
c﴿ Tổng S là:
﴾100+7﴿.32:2=3424
26 tháng 11 2016
a) tổng trên có số số hạng là :
( 100 - 7 ) : 3 + 1 = 32 ( số )
b ) S là dãy số cách đều tăng dần có khoảng cách 2 số liên tiếp là 3
Số hạng thứ 22 là :
7 + 3 . ( 22 - 1 ) = 70
c) tổng S là :
( 100 + 7 ) x 32 : 2 = 3424
Đáp số : a ) 32 số
b ) 90
c ) 3424
NT
2
7 tháng 12 2018
Đặt A = 1 + 2 + 4 + ... + 8192
A = 1 + 2 + 22 + ... + 213
=> 2A = 2 + 22 + 23 + ... + 214
=> 2A - A = ( 2 + 22 + 23 + ... + 214 ) - ( 1 + 2 + 22 + ... + 213 )
<=> A = 214 - 1
<=> A = 16383
Vậy A = 16383
7 tháng 12 2018
16383
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22 tháng 7 2015
S = 1 + 2 + 2x2 + 2x2x2 + ... +2x2x..x2 (13 thừ sô nhân 2)
2S = 2 + 2x2 +2x2x2 +..+2x2x2x..x2 (14 thùa số)
2S - S = 2 + 2x 2 + 2x 2x 2 + .. +2x2x2..x2(14 số x2 ) - 1 - 2 - 2x2 - 2x 2 - ... - 2x2x2..x2 ( 13 thừa số nhân 2)
S = 2x2x2x..x2 (14 thùa soos) - 1
S = 16384 - 1 = 16383
S = 1 + 2 + 2x2 + 2x2x2 + ... +2x2x..x2 (13 thừ sô nhân 2)
2S = 2 + 2x2 +2x2x2 +..+2x2x2x..x2 (14 thùa số)
2S - S = 2 + 2x 2 + 2x 2x 2 + .. +2x2x2..x2(14 số x2 ) - 1 - 2 - 2x2 - 2x 2 - ... - 2x2x2..x2 ( 13 thừa số nhân 2)
S = 2x2x2x..x2 (14 thừa số) - 1
S = 16384 - 1 = 16383
Chúc bạn học tốt....
Sx2=[1+2+4+8+16+32+...+8192]x2
sx2=[2+4+8+16+32+64+...16384]
sx2-s=(2+4+8+16+32+64+...16384)-(1+2+4+8+16+32+...+8192)
s=16384-1
s=16383