TN
6
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Các câu hỏi dưới đây có thể giống với câu hỏi trên
TN
2
KB
23 tháng 6 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 thừa số) - 1
S = 16384 - 1 = 16383
Chúc bạn học tốt....
HT
6 tháng 6 2017
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
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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PH
2
D
んんĐạ¡
VIP
31 tháng 7 2021
A=1+2+4+8+16+...+8192A=1+2+4+8+16+...+8192
A=20+21+22+23+24+....+213A=20+21+22+23+24+....+213
2A=21+22+23+24+....+2142A=21+22+23+24+....+214
2A−A=(21+22+23+24+...+214)−(20+21+22+23+24+...+213)2A−A=(21+22+23+24+...+214)−(20+21+22+23+24+...+213)
⇒A=214−1=16383
31 tháng 7 2021
Giải :
A = 1 + 2 + 4 + 8 + ... + 8192
=> A = 20 + 21 + 22 + 23 + ... + 213
=> 2A = 21 + 22 + 23 + 24 + ... + 214
=> 2A - A = ( 21 + 22 + 23 + 24 + ... + 214 ) - ( 20 + 21 + 22 + 23 + ... + 213 )
=> A = 214 - 20
=> A = 16 384 - 1 = 16 383
DK
2
15 tháng 6 2016
A=1+2+4+8+16+...+8192
2A=2+4+8+16+32+...+16384
2A-A=16384-1
A=16383
Lên lớp 6 em sẽ hiểu rõ cách làm hơn bằng cách viết các số dưới dạng lũy thừa
MT
4
PN
5
KV
13 tháng 6 2023
Đặt A = 1 + 2 + 3 + 4 + ... + 2023
Tổng có 2023 - 1 + 1 số hạng
A = (2023 + 1) × 2023 : 2
= 2047276
-----------------------
Đặt B = 20 + 21 + 22 + ... + 2024
Tổng có: 2024 - 20 + 1 = 2005 số hạng
B = (2024 + 20) × 2005 : 2
= 2049110
------------------------
Đặt C = 2 + 4 + 6 + ... + 2024
Tổng có (2024 - 2) : 2 + 1 = 1012 số hạng
C = (2024 + 2) × 1012 : 2
= 1025156
------------------------
Đặt D = 1 + 2 + 4 + 8 + 16 + ... + 8192
2 × D = 2 + 4 + 8 + 16 + 32 + ... + 16384
2 × D - D = (2 + 4 + 8 + 16 + 32 + ... + 16384) - (1 + 2 + 4 + 8 + 16 + ... + 8192)
= 16384 - 1
= 16383
Vậy D = 16383
TA
13 tháng 6 2023
\(a,A=1+2+3+4+5..+2023\)
Số số hạng:
\(\left(2023-1\right):1+1=2023\)
Tổng :
\(\dfrac{\left(2023+1\right).2023}{2}=2047276\)
\(b,20+21+22+..+2024\)
Số số hạng:
\(\left(2024-20\right):1+1=2005\)
Tổng:
\(\dfrac{\left(2024+20\right).2005}{2}=2049110\)
\(c,2+4+6+..+2024\)
Số số hạng:
\(\left(2024-2\right):2+1=1012\)
Tổng:
\(\dfrac{\left(2024+2\right).1012}{2}=1025156\)
16383
Bạn lấy: (8192+1) x SSH :2