Câu 1:So sánh
290và 536
ƯCLN(90;36)=18
Ta có:290=(25)18=3218
536=(52)18=2518
\(\Rightarrow32^{18}>25^{18}\) vậy nên \(2^{90}>5^{36}\)
Câu 1:
Ta có: \(2^{90}=2^5.2^{18}\); \(5^{36}=5^{18}.5^2\)
Mà 32 > 25 \(\Rightarrow32^{18}>25^{18}\)
Vậy \(2^{90}>5^{36}\)
Câu 2:
\(A=\dfrac{2026}{\left|x-2013\right|+2}\)
Ta có: \(\left|x-2013\right|\ge0\)
\(\Rightarrow\left|x-2013\right|+2\ge0\)
\(\Rightarrow\dfrac{2026}{\left|x-2013\right|+2}\le\dfrac{2026}{2}=2013\)
\(\Rightarrow A\le2013\Leftrightarrow x=2013\)