S=1+2+4+8+16+32+..............+8192
K = 1 + 2 + 4 + 8 + 16 + 32 +..... + 8192 = ?
2+4+8+16+32+....+4096+8192
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
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
Tính ; 2 + 4 + 8 + 16 + 32 + 64 +..... + 8192
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
dãy trên có số chữ số là:
( 8192 - 2 ) : 2 + 1 = 4096
tổng là:
( 2 + 8192 ) x 4096 : 2 = 16781312
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)
Tính tổng :
1 + 2 +4 +8 +16 + 32 + .... +8192
[ trình Bày lời giải ]
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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tính nhanh
1 + 2 + 4 + 8 + 16 + 32 + ..... + 8192
mik nghĩ là bằng 16383 nhung mà ko biết có đúng ko
đáp án là 16383
chắc chắn 10000000000000000000......%luôn
Tính tổng S =1 + 2 + 4 + 8 + 16 + … + 8192 bằng bao nhiêu?
Tính tổng S =1 + 2 + 4 + 8 + 16 + … + 8192 bằng bao nhiêu?
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 + ... + 4096 + 8192
A=1+2+2^2+...+2^13
=>2A=2+2^2+...+2^14
=>2A-A=2^14-1
=>A=2^14-1
1+2+4+8+16+...+4096+8192
8192-1):1+1=8192
tổng:8192+1)x8192:2=33558528
k mik nha
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