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\(6^8và16^{12}=\left(6.8\right)^0và\left(16.3\right)^9=48< 48^9\)
6⁸ = (6²)⁴ = 36⁴
16¹² = (16³)⁴ = 4096⁴
Do 36 < 4096 nên 36⁴ < 4096⁴
Vậy 6⁸ < 16¹²
a) Vì \(-45< -16\) nên \(\left(-\dfrac{45}{17}\right)^{15}< \left(\dfrac{-16}{17}\right)^{15}\)
b) Vì \(21< 23\) nên \(\left(-\dfrac{8}{9}\right)^{21}< \left(-\dfrac{8}{9}\right)^{23}\)
c) \(27^{40}=3^{3^{40}}=3^{120}\)
\(64^{60}=8^{2^{60}}=8^{120}\)
Vì \(3< 8\) nên \(3^{120}< 8^{120}\) hay \(27^{40}< 64^{60}\)
con ai kooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo
a, \(4^{100}=\left(2^2\right)^{100}=2^{200}< 2^{202}\)
\(\Rightarrow\text{ }4^{100}< 2^{202}\)
b, \(3^0=1< 5^8\)
\(3^0< 5^8\)
c, \(\left(0,6\right)^0=1\)
\(\left(-0,9\right)^6=\left(0,9\right)^6\)
\(\Rightarrow\text{ }\left(0,6\right)^0< \left(-0,9\right)^6\)
d,
e, \(8^{12}=\left(2^3\right)^{12}=2^{36}=2^{16}\cdot2^{20}=2^{16}\cdot\left(2^4\right)^5=2^{16}\cdot16^5\)
\(12^8=\left(2^2\cdot3\right)^8=2^{16}\cdot3^8=2^{16}\cdot\left(3^2\right)^4=2^{16}\cdot9^4\)
Vì \(2^{16}\cdot16^5>2^{16}\cdot9^4\text{ }\Rightarrow\text{ }8^{12}>12^8\)
\(-\left(-\dfrac{1}{16}\right)^{100}=-\left(-\dfrac{1}{2^4}\right)^{100}=-\left(\dfrac{1}{2^4}\right)^{100}=-\left[\left(\dfrac{1}{2}\right)^4\right]^{100}=-\left(\dfrac{1}{2}\right)^{400}=-\dfrac{1}{2^{400}}\)
\(-\left(-\dfrac{1}{8}\right)^{150}=-\left(-\dfrac{1}{2^3}\right)^{150}=-\left(\dfrac{1}{2^3}\right)^{150}=-\left[\left(\dfrac{1}{2}\right)^3\right]^{150}=-\left(\dfrac{1}{2}\right)^{450}=-\dfrac{1}{2^{450}}\)
\(\dfrac{1}{2^{400}}>\dfrac{1}{2^{450}}\Rightarrow-\dfrac{1}{2^{400}}< -\dfrac{1}{2^{450}}\)
Vậy \(-\left(-\dfrac{1}{6}\right)^{100}< -\left(-\dfrac{1}{8}\right)^{150}\)
a,312 và 58
Ta có:312=(33)4=274
58=(52)4=254
Vì 274>254 nên 312>58
b,(0,6)9 và (0,9)6
Ta có:(0,9)6>(0,6)6 mà (0,6)6>(0,6)9
\(\Rightarrow\)(0,6)9<(0,9)6
c,52000 và 101000
Ta có:52000=(52)1000=251000>101000
\(\Rightarrow\)52000>101000
d,?????
648=(26)8=248
1612=(24)12=248
Vì 248=248 nên 648=1612
648 = (26)8 = 248
1612 = (24)12 = 248
Vì 248 = 248 => 1612 = 648
Vậy 648 = 1612