Giải:
a) Có:
\(9^6=\left(3^2\right)^6=3^{12}\)
\(27^4=\left(3^3\right)^4=3^{12}\)
Vì \(3^{12}=3^{12}\)
Nên \(9^6=27^4\).
b) Có:
\(2002.2006=2002.\left(2004+2\right)=2002.2004+2002.2\)
\(2004^2=2004.2004=2004.\left(2002+2\right)=2004.2002+2004.2\)
Vì \(2002.2< 2004.2\)
Nên \(2002.2004+2002.2< 2002.2004+2004.2\)
Hay \(2002.2006< 2004^2\)
Vậy \(2002.2006< 2004^2\).
Chúc bạn học tốt!!!
a) \(9^6=\left(3^2\right)^6=3^{12}\)
\(27^4=\left(3^3\right)^4=3^{12}\)
Vì \(3^{12}=3^{12}\Leftrightarrow9^6=27^4\)
b)
\(2002.2006=2002.\left(2004+2\right)\)\(=2002.2+2002.2004\)
\(2004^2=2004.2004=2004\left(2002+2\right)=2004.2+2004.2002\)
Vì \(2004.2>2002.2\Leftrightarrow2002.2004+2004.2>2002.2004+2002.2\)
\(\Leftrightarrow2002.2006< 2004^2\)