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

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

giúp em với ạ 8:45 em đi học thêm rồi

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

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

đáp án là 16383

chắc chắn 10000000000000000000......%luôn

8192-1):1+1=8192

tổng:8192+1)x8192:2=33558528

k mik nha

cảm ơn nha

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:

\(\dfrac{\left(2024+2\right).1012}{2}=1025156\)