tính nhanh
1 + 2 + 4 + 8 + 16 + 32 + ..... + 8192
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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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
K = 1 + 2 + 4 + 8 + 16 + 32 +..... + 8192 = ?
S=1+2+4+8+16+32+..............+8192
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 thùa soos) - 1
S = 16384 - 1 = 16383
Tính nhanh
1×2×3×4×5×6×7×8×9×10×11×12×13×14×15×16×17×18×19×20
tính : 1++2+4+8+16+...+4096+8192=
Tính: 1+2+4+8+16+...................+4096+8192
Cách 1:
A x 2 = 2 + 4 + 8 + ....................... + 16384
A x 2 – A = 16384 – 1 = 16383
Vậy A = 16383
Cách 2: Ta thấy: Tổng 3 số hạng đầu là:
1 + 2 + 4 = 3 + 4
Tổng 4 số hạng đầu là:
1 + 2 + 4 + 8 = 7 + 8
Tổng 5 số hạng đầu là:
1 + 2 + 4 + 8 + 16 = 15 + 16
Theo quy luật đó ta sẽ tính được kết quả của tổng trên là:
A = 1 + 2 + 4 + 8 + ..................... + 4096 + 8192 = 8191 + 8192 = 16383
Vậy A = 16383
Cách 3: Nhận xét:
2 = 1 + 1
4 = (1 + 2) + 1
8 = (1 + 2 + 4) + 1
......................................................................................................................
8192 = (1 + 2 + 4 + ............... + 4096) + 1
Vậy A = 8192 – 1 + 8192 = 16383
Tính: 1 + 2 + 4 + 8 + 16 + … + 4096 + 8192 =