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\(a+b+c=0\)
\(\Leftrightarrow\left(a+b+c\right)^2=0\)
\(\Leftrightarrow a^2+b^2+c^2+2\left(ab+bc+ac\right)=0\)
\(\Leftrightarrow a^2+b^2+c^2=0\)
=>a=b=c=0
\(A=\left(0+1\right)^{2016}+\left(0-1\right)^{2017}+0^{2018}\)
\(=1-1+0=0\)
So sánh \(A=\frac{2017^{2016}+1}{2017^{2017}+1}\)và\(B=\frac{2017^{2017}+1}{2017^{2018}+1}\)
ta có: \(\left(2017^{2016}+1\right)\left(2017^{2018}+1\right)=2017^{2016+2018}+2017^{2016}+2017^{2018}+1\)
=\(2017^{4034}+2017^{2017}\cdot\frac{1}{2017}+2017^{2017}\cdot2017+1=2017^{4034}+2017^{2017}\left(\frac{1}{2017}+2017\right)+1\)
\(\left(2017^{2017}+1\right)\left(2017^{2017}+1\right)=2017^{4034}+2\cdot2017^{2017}+1\)
Vì \(2017+\frac{1}{2017}>2\)nên\(2017^{4034}+2017^{2017}\left(2017+\frac{1}{2017}\right)+1>2017^{4034}+2\cdot2017^{2017}+1\)
\(\Rightarrow\left(2017^{2016}+1\right)\left(2017^{2018}+1\right)>\left(2017^{2017}+1\right)\left(2017^{2017}+1\right)\)
\(\Rightarrow\frac{2017^{2016}+1}{2017^{2017}+1}>\frac{2017^{2017}+1}{2017^{2018}+1}\)
\(\Rightarrow A>B\)
\(B=2016^2+2017^2-2\\ B=2016^2-1+2017^2-1\\ B=\left(2016-1\right)\left(2016+1\right)+\left(2017-1\right)\left(2017+1\right)\\ B=2015.2017+2016.2018=A\)