Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
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
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
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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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
s=1/21 + 1/22+1/23+.........+1/210
2s= 1/22 +1/23+.........+1/210+1/211
2s-s= ( 1/22 +1/23+.........+1/210+1/211 ) -(1/21 + 1/22+1/23+.........+1/210)
s= 1/211 -1/2
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
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.
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
A x 2 = 2 + 4 + 8 + ....................... + 16384
A x 2 – A = 16384 – 1 = 16383
Vậy A = 16383
Tính 2A
Lấy 2A - A = A = 16383
Đáp số: 16383
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