so sánh bằng lời
a, 10750 và 7375
b, 547 và 11972
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Ta có:
\(5^{217}>5^{216}\)
Mà: \(5^{216}=5^{3\cdot72}=\left(5^3\right)^{72}=125^{72}\)
Lại có: \(125>119\Rightarrow125^{72}>119^{72}\)
\(\Rightarrow5^{216}>119^{72}\)
\(\Rightarrow5^{217}>119^{72}\)
a. \(5^{127}=5.5^{126}=5.125^{72}>119^{72}\)
\(\Rightarrow5^{217}>119^{72}\)
b. \(2^{1000}=\left(2^5\right)^{200}=32^{200}\)
\(5^{400}=\left(5^2\right)^{200}=25^{200}\)
\(\Rightarrow2^{1000}>5^{400}\)
c. \(9^{12}=\left(3^2\right)^{12}=3^{24}\)
\(27^7=\left(3^3\right)^7=3^{21}\)
\(\Rightarrow9^{12}>27^7\)
d. \(125^{80}=\left(5^3\right)^{80}=5^{240}\)
\(25^{118}=\left(5^2\right)^{118}=5^{236}\)
\(\Rightarrow125^{80}>25^{118}\)
e. \(5^{40}=\left(5^4\right)^{10}=625^{10}\)
\(\Rightarrow5^{40}>620^{10}\)
f. \(27^{11}=\left(3^3\right)^{11}=3^{33}\)
\(81^8=\left(3^4\right)^8=3^{32}\)
\(\Rightarrow27^{11}>81^8\)
a) \(2^{300}=\left(2^3\right)^{100}=8^{100}\)
\(3^{200}=\left(3^2\right)^{100}=9^{100}>8^{100}\)
\(\Rightarrow2^{300}< 3^{200}\)
b) \(99^{20}=\left(99^2\right)^{10}=9801^{10}< 9999^{10}\Rightarrow99^{20}< 9999^{10}\)
c) \(3^{500}=\left(3^5\right)^{100}=243^{100}\)
\(7^{300}=\left(7^3\right)^{100}=343^{100}>243^{100}\)
\(\Rightarrow3^{500}< 7^{300}\)
a: \(\dfrac{-2}{37}=\dfrac{-82}{37\cdot41}\)
\(\dfrac{-3}{41}=\dfrac{-3\cdot37}{41\cdot37}=\dfrac{-111}{41\cdot37}\)
mà -82>-111
nên \(-\dfrac{2}{37}>-\dfrac{3}{41}\)
b: \(\dfrac{57}{47}=1+\dfrac{10}{47}\)
\(\dfrac{557}{547}=1+\dfrac{10}{547}\)
mà 10/47>10/547
nên \(\dfrac{57}{47}>\dfrac{557}{547}\)
hay \(-\dfrac{57}{47}< -\dfrac{557}{447}\)
c: \(\dfrac{139}{155}=1-\dfrac{16}{155}\)
\(\dfrac{141}{157}=1-\dfrac{16}{157}\)
mà 16/155>16/157
nên \(\dfrac{139}{155}< \dfrac{141}{157}\)
Vì \(37< 46\) nên \(\frac{278}{37}>\frac{287}{46}\)
Ta có:
\(\frac{547}{216}-2=\frac{115}{216}\)
\(\frac{546}{215}-2=\frac{116}{215}\)
Vì \(\frac{115}{216}< \frac{116}{215}\) nên \(\frac{547}{216}< \frac{546}{215}\)
a) \(\frac{278}{37}=7+\frac{19}{37}\) \(\frac{287}{46}=7-\frac{35}{46}\)
\(\frac{278}{37}>7>\frac{287}{46}\Rightarrow\frac{278}{37}>\frac{287}{46}\)
b) Ta có: \(\frac{547}{216}=1+\frac{331}{216}\)
\(\frac{546}{215}=1+\frac{331}{215}\)
mà \(\frac{331}{216}< \frac{331}{215}\)
=> \(\frac{547}{216}< \frac{546}{215}\)
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