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x+(x+1)+(x+2)+(x+3)+...+(x+2016)=2017
( x + x + x + x + ... + x ) + ( 1 + 2 + 3 + ... + 2016 ) = 2017
2017x + 2033136 = 2017
2017x = 2017 - 2033136
2017x = -2031119
x = -2031119 : 2017
x = -1007
Ta có : x + (x + 1) + (x + 2) + (x + 3) +......+ (x + 2016) = 2017
=> (x + x + x + ..... + x) + (1 + 2 + 3 + .... + 2016) = 2017
=> 2017x + 2033136 = 2017
=> 2017x = 2017 - 2033136
=> 2017x = -203119
=> x = -203119 : 2017
=> x = -1007
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a) \(22-x\left(1-4x\right)=\left(2x+3\right)^3\)
\(\Leftrightarrow22-x+4x^2=8x^3+36x^2+54x+27\)
\(\Leftrightarrow-x-54x+4x^2-36x^2-8x^3=-22+27\)
\(\Leftrightarrow-8x^3-32x^2-55x=5\Leftrightarrow-8x^3-32x^2-55x-5=0\)
Bn tự làm tiếp nhé
b) \(\frac{2x}{3}+\frac{2x-1}{6}=\frac{4-x}{3}\Leftrightarrow\frac{2.2x}{6}+\frac{2x-1}{6}=\frac{2\left(4-x\right)}{6}\)
\(\Leftrightarrow2.2x+2x-1=2\left(4-x\right)\Leftrightarrow4x+2x-1=8-2x\)
\(\Leftrightarrow6x-1=8-2x\Leftrightarrow8x=9\Leftrightarrow x=\frac{9}{8}\)
Vậy phương trình có tập nghiệm S ={9/8}
c) \(\frac{x-1}{2019}+\frac{x-2}{2018}=\frac{x-3}{2017}+\frac{x-4}{2016}\)
\(\Leftrightarrow\left(\frac{x-1}{2019}-1\right)+\left(\frac{x-2}{2018}-1\right)=\left(\frac{x-3}{2017}-1\right)+\left(\frac{x-4}{2016}-1\right)\)
\(\Leftrightarrow\frac{x-2020}{2019}+\frac{x-2020}{2018}-\frac{x-2020}{2017}-\frac{x-2020}{2016}=0\)
\(\Leftrightarrow\left(x-2020\right)\left(\frac{1}{2019}+\frac{1}{2018}+\frac{1}{2017}+\frac{1}{2016}\right)=0\)
Do \(\frac{1}{2019}+\frac{1}{2018}+\frac{1}{2017}+\frac{1}{2016}>0\)
Nên \(x-2020=0\Leftrightarrow x=2020\)
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Xét :
1. Nếu x = 2016 hoặc x = 2017 thì thỏa mãn đề bài
2. Nếu \(x< 2016\) thì \(\left|x-2016\right|^{2016}>0\) , \(\left|x-2017\right|^{2017}>1\)
Suy ra \(\left|x-2016\right|^{2016}+\left|x-2017\right|^{2017}>1\)=> Vô nghiệm.
3. Nếu \(x>2017\) thì \(\left|x-2016\right|^{2016}>1\) , \(\left|x-2017\right|^{2017}>0\)
Suy ra \(\left|x-2016\right|^{2016}+\left|x-2017\right|^{2017}>1\) => Vô nghiệm.
Vậy pt có hai nghiệm là ............................
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\(\left|x-2016\right|-\left|x-2017\right|\le\left|x-2016-x+2017\right|=1\)
Dấu = xảy ra khi \(x\ge2017\)
Tìm x biết: |x-2016| -|x-2017| =1
Giải:
Gọi A= |x-2016| -|x-2017|
Vì |x| \(\ge\) 0
Nên | x-2016| -| x-2017| \(\ge\)0
mà | x-2016| -| x-2017| \(\ge\) | x-2016- x-2017|
=> |-1| = 1
GTNN của của A = 1 Dấu ''='' xảy ra khi
( x-2017) (2016- x) \(\ge\) 0
=> 2016 \(\le\)x \(\le\) 2017
Vậy:..........................
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a: ĐKXĐ: x<>1; x<>2; x<>-2; x<>-1
\(P=\dfrac{2017x+2017-2016x+2016-2014x-2016}{\left(x-1\right)\left(x+1\right)}\cdot\dfrac{\left(x-1\right)\left(x+1\right)}{\left(x-2\right)\left(x+2\right)}\)
\(=\dfrac{-2015x+2017}{x^2-4}\)