Bạn chưa đăng nhập. Vui lòng đăng nhập để hỏi bài

Những câu hỏi liên quan
Lê Xuân Thành
Xem chi tiết
nguyenphucthang
Xem chi tiết
Ngô Thị Yến Nhi
14 tháng 8 2016 lúc 10:13

Gọi dãy số : 

2 + 4 + 8 + 16 + 32 +....+ 4096 + 8192 là : A

Đặt A x 2 = 2 + 4 +8 +16 + 32 + ....+ 16384 

Cùng thêm 1 và bớt 1 ta có như sau : 

A x 2 = 1 + 2 + 4 + 8 + 16 + .....+ 1892 + 16384 - 1 

A x 2 = A + 16384 - 1 

A = 16384 -1 

A = 16383 

Trần Văn Giáp
14 tháng 8 2016 lúc 10:10

mk biet lam

Pham Minh Hai
14 tháng 8 2016 lúc 10:20

Dãy số trên có số số hạng là

         \(\left(8192-2\right):2+1=4096\)

Dạy trên có tổng là

       (2+8192).4096:2=16781312

Lợn Còii
Xem chi tiết
Trần Nhật Quỳnh
14 tháng 3 2017 lúc 21:46

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

Maria
14 tháng 3 2017 lúc 21:47

dãy trên có số chữ số là:

( 8192 - 2 ) : 2 + 1 = 4096

tổng là:

( 2 + 8192 ) x 4096 : 2 = 16781312

Phan Trà Giang
14 tháng 3 2017 lúc 21:53

2 + 4 + 6 + ... + 8192

= 2 + 4 + 6 + 8 + 16 + 32 + 64 + 128 + 256 + 512 + 1024 + 2048 + 4096 + 8192 = 16382

(Quy luật : Lấy một số nhân với 2 sẽ ra số liền kề nó)

nguyễn tuấn anh
Xem chi tiết
Trần Thanh Phương
7 tháng 12 2018 lúc 18:11

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

Nguyễn Minh Quân
7 tháng 12 2018 lúc 18:56

16383

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mã tuấn việt
Xem chi tiết
Dương Ngọc Viên
28 tháng 2 2017 lúc 10:08

mik nghĩ là bằng 16383 nhung mà ko biết có đúng ko 

Trương Bình Nhi
28 tháng 2 2017 lúc 10:15

đáp án là 16383

chắc chắn 10000000000000000000......%luôn

Trương Bình Nhi
28 tháng 2 2017 lúc 10:16

16383

Trần Ngọc Quốc Nam
Xem chi tiết
Phạm Kim Cương
18 tháng 2 2017 lúc 19:56

16383

Mai Bloom Winx
18 tháng 2 2017 lúc 19:57

Bạn lấy: (8192+1) x SSH :2

Thuong Thuon...
18 tháng 2 2017 lúc 19:58

Tổng là 16383 nhé !

Trần Ngọc Quốc Nam
Xem chi tiết
Kẻ Bí Mật
23 tháng 6 2015 lúc 7:37

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....

hà thùy linh
6 tháng 6 2017 lúc 16:15

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

Nguyễn Hà Linh
Xem chi tiết
Nguyễn Lê Phước Thịnh
13 tháng 9 2023 lúc 14:03

A=1+2+2^2+...+2^13

=>2A=2+2^2+...+2^14

=>2A-A=2^14-1

=>A=2^14-1

Quang Đoàn Minh
Xem chi tiết
Rotten Girl
20 tháng 10 2016 lúc 16:49

8192-1):1+1=8192

tổng:8192+1)x8192:2=33558528

k mik nha

Quang Đoàn Minh
21 tháng 10 2016 lúc 9:36

cảm ơn nha

Quang Đoàn Minh
6 tháng 11 2016 lúc 7:18

Có 19 con ruồi đậu trên một mặt bàn hình vuông có cạnh 3dm .Chứng tỏ rằng phải có ít nhất 3 con ruồi là ở vị trí 3 đỉnh của một tam giác có diện tích bé hơn 1dm2