Tính tổng :
1 + 2 +4 +8 +16 + 32 + .... +8192
[ trình Bày lời giải ]
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
DN
5
20 tháng 7 2017
Tính nhanh tổng sau A = 1+2+4+8+16+32 +.....+ 8192
****************************************...
Đặt A × 2 = 2 + 4 +8 +16 + 32 + ....+ 16384
Cùng thêm 1 và bớt 1 ta có như sau:
A × 2 = 1 + 2 + 4 + 8 + 16 + .....+ 1892 + 16384 -1
A × 2 = A + 16384 - 1
A = 16384 -1
A = 16383
****************************************..
20 tháng 7 2017
A = 1 + 2 + 4 + ... + 8192
A x 2 = 2 +4 + 8 + ... + 16384
A = 16384 - 1
A = 16383
23 tháng 10 2017
\(A=1+2+4+8+...+8192\)
\(2A=2+4+8+...+16384\)
\(2A-A=\left(2+4+...+16384\right)-\left(1+2+...+8192\right)\)
\(A=16384-1\)
\(A=16383\)
14 tháng 3 2017
Đặt A = 1 + 2 + 4 + 8 + 16 + … + 4096 + 8192
Ta có: A = 20 + 21 + 22 + 23 + 24 + … + 212 + 213 (1)
Nhân cả hai vế của (1) cho 2, ta được: 2A = 21 + 22 + 23 + 24 + 25 + … + 213 + 214 (2)
Lấy (2) - (1), ta được: 2A - A = 21 + 22 + 23 + 24 + 25 + … + 213 + 214 - (20 + 21 + 22 + 23+ 24 + … + 212 + 213)
A = 21 - 20 + 22 - 21 + 23 - 22 + 24 - 23 + 25 - 24 + … + 213 - 212 + 214 - 213
A = 214 - 20
A = 16384 - 1
A = 16383
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
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
TN
6
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
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
16383
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