\(\left(1-\dfrac{1}{2}\right).\left(1-\dfrac{1}{3}\right).\left(1-\dfrac{1}{4}\right).....\left(1-\dfrac{1}{2004}\right)\)
\(=\dfrac{1}{2}.\dfrac{2}{3}.\dfrac{3}{4}....\dfrac{2002}{2003}.\dfrac{2003}{2004}\)
\(=\dfrac{1}{2004}\)
cíu tui zới
tui hứa sẽ tick
3) 2x + 3 + 2x = 36
4) 4x+1 - 22x = 12
5) 5x+3 - 5x+1= 3000
4) 4x+1 - 22x
tính nhanh
(1-1/2)x(1-1/3)x(1-1/4)x......(1-1/2003)x(1-1/2004)
1/tính nhanh
a/1904.(2004-57)-2004.(1904-57)
b/\((\frac{1}{2}-1)\times(\frac{1}{3}-1)\times(\frac{1}{4}-1)\times...\times(\frac{1}{2004}-1)\)1)
c/\(\left(1+2^4+2^8\right):\left(1+2+2^2+2^3+2^4+2^5+2^6+2^7+2^8+2^9+2^{10}+2^{11}\right)\)
tinh nhanh. A=(1-1/2)*(1-1/3)*(1-1/4) ... *(1-1/2003)*(1-1/2004)
Tính nhanh tổng đại số sau:
a) S=1-2-3+4+5-6-7+8+...+2001-2002-2003+2004
b) S=1+2-3-4+5+6-7-8+9+...+2002-2003-2004+2005+2006
Tính tổng: 1/2+ 1/2^2+ 1/2^3+ 1/2^4+...+1/2^2004
số 2 : tính nhanh
A = 99 - 97 + 95 -93 + 91 - 89 + .......... + 7 - 5 + 3 - 1
B = 50 - 49 + 48 - 47 + 46 - 45 + ........... + 4 - 3 + 2 - 1
C = 100 + 98 + 96 + ......... + 2 - 97 - 95 - ......... - 1
D = 1 + 3 + 5 + 7 + ......... + 999
E = 1 + 11 + 21 + 31 + ......... + 991
F = 3 + 7 + 11 + 15 + ......... + 99
H = 1 + 2 + 3 - 4 - 5 - 6 + 7 + 8 + 9 - 10 - 11 - 12 + .......... + 97 + 98 + 99 - 100 -101 - 102
I = 1 - 3 + 5 5 - 7 + 9 - 11 + ... + 2004 - 2007
K = -1 + 2 - 3 + 4 - 5 + 6 - 7 +.... + 2004 - 2005
G =1 - 2 - 3 + 4 + 5 - 6 - 7 + 8 +..... + 2004 + 2005
N = 1 - 4 + 7 - 10 + ..... + 2995 - 2998
(7x-19)-(5x-12)=3x-(9-2x)-1
cíu cíu tui zớiiiiiiiiii
A=1/2^2+1/2^4+1/2^6+.....+1/2^100
B=1-2/2^100
tính A/B
ngày mai tui nộp zùi hãy giúp tui nhé nhanh lên đc ko ?
