x + x + x + x = 2000
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2000 x 2 = 4000 10000 x 2 = 20000
2000 x 4 = 8000 11000 x 3 = 33000
2000 x 5 = 10000 12000 x 4 = 48000
Tính nhẩm
2000 x 2 = 4.000 10000 x 2 = 20.000
2000 x 4 = 8.000 11000 x 3 = 33.000
2000 x 5 = 10.000 12000 x 4 = 48.000
![](https://rs.olm.vn/images/avt/0.png?1311)
b) 5x(x-2000)-x+2000=0
\(\Rightarrow5x\left(x-2000\right)-\left(x-2000\right)=0\\ \Rightarrow\left(x-2000\right)\left(5x-1\right)=0\)
\(\Rightarrow\left\{{}\begin{matrix}x-2000=0\\5x-1=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0+2000\\5x=0+1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=2000\\5x=1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=2000\\x=\dfrac{1}{5}\end{matrix}\right.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
5x2 - 10000x - x +2000 = 0
\(\Leftrightarrow5x^2-10001x+2000=0\\ \Leftrightarrow\left[{}\begin{matrix}x=2000\\x=0,2\end{matrix}\right.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
tham khẢO
( X x 0,25 + 1999) x 2000=( 53+1999) x 2000
( X x 0,25 + 1999) = ( 53+1999) x 2000 : 2000
( X x 0,25 + 1999) = ( 53+1999)
( X x 0,25 + 1999) = 2052
X x 0,25 = 2052 -1999
X x 0,25 = 53
X = 53 : 0,25
X = 212
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.\left(x\times0,25+1999\right)\times2000=2052\times2000\\ \left(x\times0,25+1999\right)\times2000=4104000\\ x\times0,25+1999=4104000:2000\\ x\times0,25+1999=2052\\ x\times0,25=2052-1999\\ x\times0,25=53\\ x=53:0,25\\ x=212\)
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\(2000+2000+2000+2000.x=16000\)
\(2000.4\) \(.x=16000\)
\(8000\) \(.x=16000\)
\(x=16000:8000\)
\(x=2\)
8000 x X = 16 000
= 16 000 : 8000
= 2
tk minh minh tk lai
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![](https://rs.olm.vn/images/avt/0.png?1311)
Đặt \(A=1-x+x^2-x^3+...-x^{1999}+x^{2000}\)
\(B=1+x+x^2+x^3+...+x^{1999}+x^{2000}\)
Ta có : \(\left(x^2-1\right).P\left(x\right)=\left(x+1\right)A\left(x-1\right)B\)
\(=\left(x^{2001}+1\right)\left(x^{2001}-1\right)\)
\(=\left(x^{2001}\right)^2-1=\left(x^2\right)^{2001}-1^{2001}\)
\(=\left(x^2-1\right)\left(x^{4000}+x^{3998}+x^{3996}+...+x^2+1\right)\)
\(\Rightarrow P\left(x\right)=x^{4000}+x^{3998}+...+x^2+1\)
Theo đề bài ta có : \(P\left(x\right)=a_o+a_1x+...+a_{4000}x^{4000}\)
Do đó : hệ số chẵn sẽ = 1, hệ số lẻ = 0
\(\Rightarrow a_{2001}=0\)
Chúc bạn học tốt !!
![](https://rs.olm.vn/images/avt/0.png?1311)
( x * 0,25 + 1999 ) * 2000 = ( 53 + 1999 ) * 2000
=> x * 0,25 = 53
=> x = 53 : 0,25
=> x = 212
( 53 + 1999 ) * 2000 = 4104000
x = (4104000 : 2000 - 1999 ) : 0,25
x = 53 : 0,25
x = 212
![](https://rs.olm.vn/images/avt/0.png?1311)
( X x 0,25 + 1999) x 2000=( 53+1999) x 2000
( X x 0,25 + 1999) = ( 53+1999) x 2000 : 2000
( X x 0,25 + 1999) = ( 53+1999)
( X x 0,25 + 1999) = 2052
X x 0,25 = 2052 -1999
X x 0,25 = 53
X = 53 : 0,25
X = 212
![](https://rs.olm.vn/images/avt/0.png?1311)
x + x + x + x = 2000
x * 4 = 2000
x = 2000 : 4
x = 500
k mk nha
x+x+x+x=2000
x.4=2000
x=2000:4
x =500