Tính nhanh
2004x2006-2003 / 2005x2005-2004
K
Khách
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1
25 tháng 4 2016
\(A=\frac{2004x2006+10}{2005x2005+9}=\frac{2004x2005+2004+10}{2004x2005+2005+9}=\frac{2004x2005+2014}{2004x2005+2014}=1\)
CF
0
XO
11 tháng 10 2020
\(P=\frac{\frac{1}{2003}+\frac{1}{2004}-\frac{1}{2005}}{\frac{5}{2003}+\frac{5}{2004}-\frac{5}{2005}}-\frac{\frac{2}{2002}+\frac{2}{2003}-\frac{2}{2004}}{\frac{3}{2002}+\frac{3}{2003}-\frac{3}{2004}}\)
\(=\frac{\frac{1}{2003}+\frac{1}{2004}-\frac{1}{2005}}{5\left(\frac{1}{2003}+\frac{1}{2004}-\frac{1}{2005}\right)}-\frac{2\left(\frac{1}{2002}+\frac{1}{2003}-\frac{1}{2004}\right)}{3\left(\frac{1}{2002}+\frac{1}{2003}-\frac{1}{2004}\right)}\)
\(=\frac{1}{5}-\frac{2}{3}=-\frac{7}{15}\)
11 tháng 10 2020
Ta có:
\(P=\frac{\frac{1}{2003}+\frac{1}{2004}-\frac{1}{2005}}{\frac{5}{2003}+\frac{5}{2004}-\frac{5}{2005}}-\frac{\frac{2}{2002}+\frac{2}{2003}-\frac{2}{2004}}{\frac{3}{2002}+\frac{3}{2003}-\frac{3}{2004}}\)
\(P=\frac{1}{5}\cdot\left(\frac{\frac{1}{2003}+\frac{1}{2004}-\frac{1}{2005}}{\frac{1}{2003}+\frac{1}{2004}-\frac{1}{2005}}\right)-\frac{2}{3}\cdot\left(\frac{\frac{1}{2002}+\frac{1}{2003}-\frac{1}{2004}}{\frac{1}{2002}+\frac{1}{2003}-\frac{1}{2004}}\right)\)
\(P=\frac{1}{5}-\frac{2}{3}=-\frac{7}{15}\)
BT
1
VP
18 tháng 12 2018
khỏi ghi lại đề nha
= 2003 x [ ( 200 + 2004 - 48 ) - ( 52 + 2004 + 89 ) ]
= 2003 x ( 200 + 2004 - 48 - 52 - 2004 - 89 )
= 2003 x ( 200 - 48 - 52 + 2004 - 2004 - 89 )
= 2003 x ( 200 - 100 + 0 - 89 )
= 2003 x ( 100 - 89 )
= 2003 x 11
= 22033
23 tháng 12 2016
Bài 1:
\(P=\frac{\frac{1}{2003}+\frac{1}{2004}-\frac{1}{2005}}{\frac{5}{2003}+\frac{5}{2004}-\frac{5}{2005}}-\frac{\frac{2}{2002}+\frac{2}{2003}-\frac{2}{2004}}{\frac{3}{2002}+\frac{3}{2003}-\frac{3}{2004}}\)
\(\Rightarrow P=\frac{1\left(\frac{1}{2003}+\frac{1}{2004}-\frac{1}{2005}\right)}{5\left(\frac{1}{2003}+\frac{1}{2004}-\frac{1}{2005}\right)}-\frac{2\left(\frac{1}{2002}+\frac{1}{2003}-\frac{1}{2002}\right)}{3\left(\frac{1}{2002}+\frac{1}{2003}-\frac{1}{2004}\right)}\)
\(\Rightarrow P=\frac{1}{5}-\frac{2}{3}\)
\(\Rightarrow P=\frac{-7}{15}\)
Vậy \(P=\frac{-7}{15}\)
Bài 2:
Ta có: \(S=23+43+63+...+203\)
\(\Rightarrow S=13+10+20+23+...+103+100\)
\(\Rightarrow S=\left(13+23+...+103\right)+\left(10+20+...+100\right)\)
\(\Rightarrow S=3025+450\)
\(\Rightarrow S=3475\)
Vậy S = 3475
T
23 tháng 12 2016
1. \(P=\frac{\frac{1}{2003}+\frac{1}{2004}-\frac{1}{2005}}{\frac{5}{2003}+\frac{5}{2004}-\frac{5}{2005}}-\frac{\frac{2}{2002}+\frac{2}{2003}-\frac{2}{2004}}{\frac{3}{2002}+\frac{3}{2003}-\frac{3}{2004}}\)
=> P =\(\frac{\frac{1}{2003}+\frac{1}{2004}-\frac{1}{2005}}{5\left(\frac{1}{2003}+\frac{1}{2004}-\frac{1}{2005}\right)}-\frac{2\left(\frac{1}{2002}+\frac{1}{2003}-\frac{1}{2004}\right)}{3\left(\frac{1}{2002}+\frac{1}{2003}-\frac{1}{2004}\right)}\)
=> P = \(\frac{1}{5}-\frac{2}{3}\)
P = \(\frac{3}{15}-\frac{10}{15}\)
=> P =\(\frac{-7}{15}\)
2. ta có:
S = 23 + 43 + 63 +...+ 203
=> S = 13 + 10 + 23 + 20 +...+ 103 + 100
=> S = ( 13 + 23+...+ 103 ) + ( 10 + 20 +...+ 100 )
=> S = 3025 + 550
=> S = 3575
Vậy S = 3575
TK
1
TK
5
6 tháng 2 2016
N=2003(2004(9+8+7+...+2)+2015)+1
Dat A=9+8+7+...+2
A có số số hạng là (9-2)*1+1=8 so hang
A=(9+2)*8/2=44
N=2003(2004*44+2005)+1
N=2003*(88176+2005)+1
N=2003*90181+1=180632543+1=180632544
số to quá
DUYỆT NHA
\(2004\)x\(2006-\frac{2003}{2005}\)x\(2005-2004\)
\(=2004\)x\(2006-\frac{2003}{2005}\)x\(\frac{2005}{1}-2004\)
\(=2004\)x\(2006-2003-2004\)
\(=2006-2003\)
\(=3\)
2004 x 2006 - 2003 / 2005 x 2005 - 2004
= 2004 x ( 2005 + 1 ) - 2003 / ( 2004 + 1 ) x 2005 - 2004
= 2004 x 2005 + 2004 x 1 - 2003 / 2004 x 2005 + 1 x 2005 - 2004
= 2004 x 2005 + 2004 - 2003 / 2004 x 2005 + 2005 - 2004
= 2004 x 2005 + 1 / 2004 x 2005 + 1
= 1 / 1 = 1
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