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\(A=2^{2017}+2^{2016}+...+2+1\)
\(\Leftrightarrow2A=2^{2018}+2^{2017}+...+2^2+2\)
=>\(A=2^{2018}-1\)
\(D=2^{2018}-2^{2018}+1=1\)
Do x=2017 nên x+1=2018
Với x+1=2018 thì y trở thành
y= x5-(x+1).x4+(x+1).x3-(x+1).x2+(x+1).x-1
= x5- x5-x4+x4+x3-x3-x2+x-1=x-1
Với x=2017, giá trị biểu thức f(x) là
f(2017)=2017-1=2016
Vậy ...
M = 2^2018 - (2^2017 + 2^2016 + ...+ 2^1+2^0)
Đặt N = 2^2017+2^2016+...+2^1+2^0
=> 2N=2^2018 +2^2017+...+2^2+2^1
=> 2N-N = 2^2018 - 2^0
N = 2^2018 - 1
Thay N vào M có
M = 2^2018 - (2^2018-1)
M = 2^2018 - 2^2018 + 1
M = 1
\(\left(x+1\right)^6+\left(y-1\right)^4=-z^2\)
\(\Rightarrow\left(x+1\right)^6+\left(y-1\right)^4+z^2=0\)
Ta có: \(\hept{\begin{cases}\left(x+1\right)^6\ge0\\\left(y-1\right)^4\ge0\\z^2\ge0\end{cases}}\Rightarrow\left(x+1\right)^6+\left(y-1\right)^4+z^2\ge0\)
Mà \(\left(x+1\right)^6+\left(y-1\right)^4+z^2=0\)
\(\Rightarrow\hept{\begin{cases}\left(x+1\right)^6=0\\\left(y-1\right)^4=0\\z^2=0\end{cases}}\Rightarrow\hept{\begin{cases}x=-1\\y=1\\z=0\end{cases}}\)
Thay x = -1, y = 1, z = 0 vào P
\(\Rightarrow P=2018.\left(-1\right)^{2016}.1^{2017}-\left(0-1\right)^{2018}\)
\(=2018-1=2017\)
Vậy...
Ta có \(A=1+2+2^2+2^3+...+2^{2017}\)
Suy ra\(2.A=2+2^2+2^3+2^4+....+2^{2018}\)
Khi đó \(2A-A=2+2^2+2^3+2^4+....+2^{2018}-\left(1+2+2^2+2^3+....+2^{2017}\right)\)
Hay \(A=2^{2018}-1\)
Ta thấy \(A=2^{2018}-1\); \(B=2^{2018}-1\)nên \(A=B\)
Vậy \(A=B\)
\(C=\left(2018^{2019}+2018^{2018}+...+2018^2+2018\right)2017+1\)
\(=\left(2018^{2019}+2018^{2018}+...+2018^2+2018\right)2018-\left(2018^{2019}+2018^{2018}+...+2018\right)-1\)
\(=\left(2018^{2020}+2018^{2019}+...+2018^3+2018^2\right)-\left(2018^{2019}+2018^{2018}+...+2018^2+2018\right)+1\)\(=2018^{2020}-2018+1\)
\(=2018^{2020}-2017\)
Đặt G=2^2017+2^2016+...+2+1
=>2G=2^2018+2^2017+...+2^2+2
=>G=2^2018-1
=>H=2^2018-2^2018+1=1
=>2018^H=2018