Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
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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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....
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
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
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
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
\(a,A=1+2+3+4+5..+2023\)
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:
\(\dfrac{\left(2024+2\right).1012}{2}=1025156\)
mik nghĩ là bằng 16383 nhung mà ko biết có đúng ko
đáp án là 16383
chắc chắn 10000000000000000000......%luôn