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CM
20 tháng 2 2019
a, Ta có :
A = 1 + 2 + 2 2 + 2 3 + 2 4 + . . . + 2 99 + 2 100
2A = 2 + 2 2 + 2 3 + 2 4 + . . . + 2 99 + 2 100 + 2 101
A = 2A – A = ( 2 + 2 2 + 2 3 + 2 4 + . . . + 2 99 + 2 100 + 2 101 ) –( 1 + 2 + 2 2 + 2 3 + 2 4 + . . . + 2 99 + 2 100 )
= 2 + 2 2 + 2 3 + 2 4 + . . . + 2 99 + 2 100 + 2 101 – 1 - 2 - 2 2 - 2 3 - 2 4 - . . . - 2 99 - 2 100
= 2 101 - 1
Vậy A = 2 101 - 1
b, Ta có.
B = 5 + 5 3 + 5 5 + . . . + 5 97 + 5 99
5 2 B = 5 2 ( 5 + 5 3 + 5 5 + . . . + 5 97 + 5 99 )
25B = 5 3 + 5 5 + . . . + 5 97 + 5 99 + 5 101
25B – B = ( 5 3 + 5 5 + . . . + 5 97 + 5 99 + 5 101 ) – ( 5 + 5 3 + 5 5 + . . . + 5 97 + 5 99 )
24B = 5 3 + 5 5 + . . . + 5 97 + 5 99 + 5 101 – 5 - 5 3 - 5 5 - . . . - 5 97 - 5 99
24B = 5 101 - 5
B = 5 101 - 5 24 = 5 5 100 - 1 24
Vậy B = 5 5 100 - 1 24
CM
4 tháng 1 2020
a, A = 1 + 5 3 + 5 5 + 5 7 + . . . + 5 99
B = 5 4 + 5 6 + 5 8 + . . . + 5 100 = 5 . ( 5 3 + 5 5 + 5 7 + . . . + 5 99 ) = 5(A – 1)
A + B – 1 = 5 3 + 5 4 + . . . + 5 100
5(A + B – 1) = 5 4 + 5 5 + . . . + 5 100 + 5 101
4(A + B – 1) = 5(A + B – 1) – (A + B – 1) = 5 101 - 5 3
=> A + B – 1 = 5 101 - 5 3 4
=> A + 5(A – 1) –1 = 5 101 - 5 3 4 => 6A – 6 = 5 101 - 5 3 4
=> A – 1 = 5 101 - 5 3 24
=> A = 5 101 - 5 3 + 24 24
b, A = 1 - 2 + 2 2 - . . . - 2 2007
A = 1 + 2 2 + . . . + 2 2006 - 2 + 2 3 + . . . + 2 2007
A = ( 1 + 2 2 + . . . + 2 2006 ) - 2 . 1 + 2 2 + . . . + 2 2006
A = - 1 + 2 2 + . . . + 2 2006
Đặt B = - 2 + 2 3 + . . . + 2 2007 = - 2 . 1 + 2 2 + . . . + 2 2006 = 2A
A + B = - 1 + 2 + 2 2 + . . . + 2 2006 + 2 2007
2(A+B) = - 2 + 2 2 + . . . + 2 2006 + 2 2007 + 2 2008
A+B = 2(A+B)–(A+B) = - 2 2008 - 1
=> A+2A = - 2 2008 - 1
=> 3A = - 2 2008 - 1
=> A = - ( 2 2008 - 1 ) 3
c, A = 7 + 7 3 + 7 5 + 7 7 + . . . + 7 1999
Đặt B = 7 2 + 7 4 + 7 6 + . . . + 7 1999 + 7 2000 = 7 ( 7 + 7 3 + 7 5 + 7 7 + . . . + 7 1999 ) = 7A
A+B = 7 + 7 2 + 7 3 + . . . + 7 1999 + 7 2000
7(A+B) = 7 2 + 7 3 + . . . + 7 1999 + 7 2000 + 7 2001
7(A+B) – (A+B) = ( 7 2 + 7 3 + . . . + 7 1999 + 7 2000 + 7 2001 ) – ( 7 + 7 2 + 7 3 + . . . + 7 1999 + 7 2000 )
6(A+B) = 7 2001 - 7
A+B = 7 2001 - 7 6
=> A + 7A = 7 2001 - 7 6 => 8A = 7 2001 - 7 6 => A = 7 2001 - 7 48
7 tháng 2 2020
Dùng công thức : Số số hạng = (Số cuối - Số đầu)/ Khoảng cách giữa 2 số + 1
Tổng = (Số số hạng)x (Số số hạng +1 ) /2 Mik làm tắt nha
a) 83x84/2 = 3486
b) 14x15/2 =105
c) Để ý thấy (46-45)=1 (44-43)=1 (2-1)=1
Có 46 số hạng, vậy có 23 nhóm =1
Vậy kết quả là 23
d) 13x14/2 = 91
e) (49-51) + (53-55) + (57-59) + (61-63) +65
= -2 -2 -2 -2 +65
= 57
7 tháng 2 2020
a) \(17+18+19+.....+99\)
Số số hạng của dãy số trên :
\( \left(99-17\right):1+1=83\)( số hạng )
Tổng của dãy số trên :
\(\frac{\left(17+99\right)\times83}{2}=4814\)
Vậy.........
b) \(23+25+....+49\)
Số số hạng của dãy số trên :
\(\left(49-23\right):2+1=14\)( số hạng )
Tổng của dãy số trên :
\(\frac{\left(23+49\right)\times14}{2}=504\)
Vậy........
c) \(46-45+44-43+....+2-1\)
\(=1+1+....+1\)( 23 chữ số 1 )
\(=1\times23\)
\(=23\)
d) \(5+8+11+14+....+38+41\)
Số số hạng của dãy số trên :
\(\left(41-5\right):3+1=13\)( số hạng )
Tổng của dãy số trên :
\(\frac{\left(5+41\right)\times13}{2}=299\)
Vậy.......
e) \(49-51+53-55+57-59+61-63+65\)
\(=\left(-2\right)+\left(-2\right)+\left(-2\right)+\left(-2\right)+65\)
\(=\left[\left(-2\right)+\left(-2\right)+\left(-2\right)+\left(-2\right)\right]+65\)
\(=\left[\left(-2\right)\times4\right]+65\)
\(=\left(-8\right)+65\)
\(=57\)
10 tháng 6 2016
A có (99-17)+1=83 phần tử
Số ở giữa sẽ là 17+(82/2) = 58
Những số khác tạo thành các cặp
A=(17+99) + (18+98)+...+58
A=116*(82/2)+58= 4814
Những bài khác tương tự
TH
3
H9
HT.Phong (9A5)
CTVHS
14 tháng 10 2023
\(A=2+2^2+...+2^{20}\)
\(2A=2^2+2^3+...+2^{21}\)
\(2A-A=2^2+2^3+...+2^{21}-2-2^2-...-2^{20}\)
\(A=2^{21}-2\)
___________
\(B=5+5^2+...+5^{50}\)
\(5B=5^2+5^3+...+5^{51}\)
\(5B-B=5^2+5^3+...+5^{51}-5-5^2-...-5^{50}\)
\(4B=5^{51}-5\)
\(B=\dfrac{5^{51}-5}{4}\)
___________
\(C=1+3+3^2+...+3^{100}\)
\(3C=3+3^2+...+3^{101}\)
\(3C-C=3+3^2+...+3^{101}-1-3-3^2-...-3^{100}\)
\(2C=3^{101}-1\)
\(C=\dfrac{3^{101}-1}{2}\)
PB
2 tháng 3 2018
Đặt A' = 23+25+27+.....+22009
Số số hạng của A' là : (22009 - 23) : 2 + 1 = 10994(số)
A' = (22009+23). 10994 : 2 = 22032. 5497 = 121109904
A = 2 + 121109904 = 121109906
Đặt B' = 22+24+26+....+2200
Số số hạng của B' là : (2200 - 22) : 2 + 1 = 1090(số)
B' = (2200 + 22) . 1090 : 2 = 2222. 545 = 1210990
B = 1 + 1210990 = 1210991
Đặt C' = 53 + 55 +57 +....+ 5101
Số số hạng của C' là :(5101 - 53) : 2 + 1 = 2525 (số)
C' = (53 + 5101) . 2525 : 2 = 6506925
C = 6506925 + 5 = 6506930
Đặt D' = 133+135+137+....+1399
Số số hạng của D' là : (1399 - 133) :2 + 1 = 634 (số)
D' = ( 133 + 1399) . 634 : 2 = 485644
D = 485644 + 13 = 485657
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Chế](data:image/jpeg;base64,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