Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(=\frac{1004}{2007}\left(\frac{-5}{4}+\frac{-1}{4}-\frac{1}{2}\right)=\frac{1004}{2007}.\left(-2\right)=-\frac{2008}{2007}\)
<=>5.(x-2)-3x(x-2)=0
<=> (x-2) ( 5-3x) =0
* x-2=0 => x= 2
* 5-3x=0 => x= 5/3
\(A=2008.\left(\frac{1}{2007}-\frac{1000}{1004}\right)-2009.\left(\frac{1}{2007}-2\right)\)
\(\Rightarrow A=2008.\frac{1}{2007}-2000-2009.\frac{1}{2007}+4018\)
\(\Rightarrow A=\frac{1}{2007}.\left(2008-2009\right)-2000+4018\)
\(\Rightarrow A=\frac{1}{2007}.\left(-1\right)-2000+4018\)
\(\Rightarrow A\approx2018\)
\(=\dfrac{2008}{2007}-2\cdot2009-\dfrac{2009}{2007}+2009\cdot2\)
=-1/2007
phá ngoặc ra ta có:
A = 2018/2017 - 2018*2019/1004 - 1/2007 +2
= 1 - 2*(2019 -1)
= 1 - 4016
= -4015
1. 2008.\(\left(\dfrac{1}{2007}-\dfrac{2009}{1004}\right)-2009\left(\dfrac{1}{2007}-2\right)\)
=\(\left(2008.\dfrac{1}{2007}-2008.\dfrac{2009}{1004}\right)-\left(2009.\dfrac{1}{2007}-2009.2\right)\)
=\(\left(\dfrac{2008}{2007}-2.2009\right)-\left(\dfrac{2009}{2007}-2.2009\right)\)
=\(\left(\dfrac{2008}{2007}-4018\right)-\left(\dfrac{2009}{2007}-4018\right)\)
=\(\dfrac{2008}{2007}-4018-\dfrac{2009}{2007}+4018\)
=\(\left(\dfrac{2008}{2007}-\dfrac{2009}{2007}\right)+\left[\left(-4018\right)+4018\right]\)
=\(\dfrac{1}{2007}.\left(2008-2009\right)+0\)
=\(\dfrac{1}{2007}.\left(-1\right)+0\)
=\(\dfrac{-1}{2007}\)
2.\(\dfrac{5^5.20^3-5^4.20^3+5^7.4^5}{\left(20+5\right)^3+4^5}\)
=\(\dfrac{5^5.\left(2^2.5\right)^3-5^4.\left(2^2.5\right)^3+5^7.\left(2^2\right)^5}{\left[\left(2^2.5\right)+5\right]^3+\left(2^2\right)^5}\)
=\(\dfrac{5^5.2^6.5^3-5^4.2^6.5^3+5^7.2^{10}}{2^6.5^3+5^3+2^{10}}\)
=\(\dfrac{5^9.2^6-5^7.2^6+5^7.2^{10}}{5^3.\left(2^6+1\right)+2^{10}}\)
=\(\dfrac{5^7.2^6\left(5^2-1-2^4\right)}{5^3\left(2^6+1\right)+2^{10}}\)
bí rồi
\(\frac{1004}{2007}.\frac{-5}{4}+1004.\frac{-1}{4}-\frac{1004}{2007}.\frac{1}{2}\)
\(=\frac{1004}{2007}.\left(-\frac{5}{4}-\frac{1}{2}\right)+1004.\frac{-1}{4}\)
\(=1004.\frac{1}{2007}.\frac{-7}{4}+1004.\frac{-1}{4}\)
\(=1004.\left(-\frac{7}{8028}+\frac{-1}{4}\right)=1004.\frac{-1007}{2014}=-502\)