K
Khách

Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.

15 tháng 6 2016

Tính 2A

Lấy 2A - A = A = 16383

Đáp số: 16383

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

3 tháng 8 2016

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
****************************************...
Chúc bn học giỏi nha

3 tháng 8 2016

Tổng sau: A= 1 + 2 + 4 + 8 + 16 + 32 + ....... + 8192

Đặt A x 2 :

= 2 + 4 + 8 + 16 + 32 + ....... + 16384

Cùng thêm 1 và bớt 1 ta có:

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

A x 2 = A + 16384 - 1

A       = 16384 - 1

=> A  = 16383

28 tháng 2 2017

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

28 tháng 2 2017

đáp án là 16383

chắc chắn 10000000000000000000......%luôn

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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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

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

21 tháng 6 2017

s=1/21 + 1/22+1/23+.........+1/210

2s=  1/2  +1/23+.........+1/210+1/211

2s-s= ( 1/2  +1/23+.........+1/210+1/211 ) -(1/21 + 1/22+1/23+.........+1/210)

s= 1/211        -1/2

30 tháng 10 2018

Thông báo thay trang thay mặt người phân phối chương trình xin tặng chương trình học online số 1 Việt Nam. Sự kiện bắt đầu từ ngày 28/10 đến 1/11

Xin chào các thành viên đang online trên trang. Sự kiện khuyến mãi được tài trợ 500 suất áo chiếc áo đá bóng Việt Nam.Mong tất cả mọi người đã xem vào truy cập sau để nhận thưởng khi xem có 1 bản đăng kí nhận miễn phí : Thời gian có hạn tặng mọi người đã tham gia tích cực -> Không tin các bạn có thể hỏi các CTV nha mình chỉ có quyền thông báo :

Copy cái này hoặc gõ :

https://lazi.vn/quiz/d/16491/nhac-edm-la-loai-nhac-the-loai-gi

<3

\(\frac{1}{4}\):0,25-\(\frac{1}{8}\):0,125-\(\frac{1}{2}\):0,5-\(\frac{1}{16}\):0,0625

=0,25:0,25-0,125:0,125-0,5:0,5-0,0625:0,0625

=1-1-1-1

=-2

Chúc bn học tốt

Lớp 5 ko có đề này nha vì lớp 5 chưa học số âm

27 tháng 12 2021

1/4 : 0,25 - 1/8 : 0,125 -1/2 : 0,5 - 1/16 : 0,0625 

= 1/4 x 4 - 1/8 x 8 - 1,2 x 2 - 1/16 x 16

= 1 - 1 - 1 - 1

= - 2

Em nghĩ là bài này bị sai dấu.

6 tháng 11 2019

A= 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 + 1/256

2A= 2(1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 + 1/256)

= 1+1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128

=>A = 2A-A =1+1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 -1/2 - 1/4 - 1/8 - 1/16 - 1/32 - 1/64 - 1/128 - 1/256

=1-1/256

=255/256

6 tháng 11 2019

TGV.Quỷ đúng rr đó

26 tháng 9 2015

A x 2 = 2 + 4 + 8 + ....................... + 16384

A x 2 – A = 16384 – 1 = 16383

Vậy A = 16383

26 tháng 9 2015

2xA = 2+4+8 ... +16384

2A - A = 16384 - 1 = 16383