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a,\(3^{200}=3^{2.100}=\left(3^2\right)^{100}=9^{100}\)
\(2^{300}=2^{3.100}=\left(2^3\right)^{100}=8^{100}\)
Vì 9100>8100 nên 3200>2300
b,\(3^{375}=3^{5.75}=\left(3^5\right)^{75}=243^{75}\)
\(5^{225}=5^{3.75}=\left(5^3\right)^{75}=125^{75}\)
Vì 24375>12575 nên 3375>5225
c,\(99^{20}=99^{2.10}=\left(99^2\right)^{10}=9801^{10}< 9999^{10}\)
Vật 9920<999910
d,\(2^{91}=2^{13.7}=\left(2^{13}\right)^7=8192^7\)
\(5^{35}=5^{5.7}=\left(5^5\right)^7=3125^7\)
Vì 81927>31257 nên 291>535
a, \(2^{300}=2^{3.100}=8^{100}\)
\(3^{200}=3^{2.100}=9^{100}\)
Vì \(9^{100}>8^{100}\Rightarrow3^{200}>2^{300}\)
b, \(2^{91}=2^{13.7}=8192^7\)
\(5^{35}=5^{5.7}=3125^7\)
Vì \(8192^7>3125^7\Rightarrow2^{91}>5^{35}\)
c, \(9^{12}=\left(3^3\right)^{12}=3^{36}\)
\(27^7=\left(3^3\right)^7=3^{21}\)
Vì \(3^{36}>3^{21}\Rightarrow9^{12}>27^7\)
a) 2^300= 2^3.100=8^100
3^200=3^2.100=9^100
Vì 9^100>8^100 => 3^100>2^300
b) 2^91=2^13.7=8192^7
5^35=5^5.7=3195^7
Vì 8192^7>3125^7 => 2^91>5^35
c) 9^12=(33)12=3^36
27^7=(33)7=3^21
Vì 3^36>3^21 => 9^12>27^7
\(7^{300}=\left(7^3\right)^{100}=343^{100}\)
\(4^{450}=\left(2^2\right)^{450}=2^{900}=\left(2^9\right)^{100}=512^{100}\)
mà \(512^{100}>343^{100}\Rightarrow4^{450}>7^{300}\)
Tham khảo nhé
b: \(7\cdot2^{13}< 8\cdot2^{13}=2^{16}\)
d: \(3^{99}=\left(3^{33}\right)^3\)
\(11^{21}=\left(11^7\right)^3\)
mà \(3^{33}>11^7\)
nên \(3^{99}>11^{21}\)
b) Áp dụng tính chất
\(\frac{a}{b}< 1\Rightarrow\frac{a}{b}< \frac{a+m}{b+m}\left(m\in N\right)\)
Ta có: \(B=\frac{10^{16}+1}{10^{17}+1}< \frac{10^{16}+1+9}{10^{17}+1+9}=\frac{10^{16}+10}{10^{17}+10}=\frac{10.\left(10^{15}+1\right)}{10.\left(10^{16}+1\right)}=\frac{10^{15}+1}{10^{16}+1}=A\)
\(\Rightarrow B< A\)
\(B< 1\Rightarrow\frac{10^{16}+1}{10^{17}+1}< \frac{10^{16}+1+9}{10^{17}+1+9}=\frac{10^{16}+10}{10^{17}+10}=\frac{10\left(10^{15}+1\right)}{10\left(10^{16}+1\right)}=\frac{10^{15}+1}{10^{16}+1}=A\)
\(\Rightarrow A>B\)
a) Cách 1: \(\left(3^2\right)^3=3^{2.3}=3^6\)
\(\left(3^3\right)^2=3^{3.2}=3^6\)
\(\left(3^2\right)^5=3^{2.5}=3^{10}\)
\(9^8=\left(3^2\right)^8=3^{2.8}=3^{16}\)
\(27^6=\left(3^3\right)^6=3^{3.6}=3^{18}\)
\(81^{10}=\left(3^4\right)^{10}=3^{4.10}=3^{40}\)
Cách 2: \(\left(3^2\right)^3=9^3\)
\(\left(3^3\right)^2=3^{3.2}=\left(3^2\right)^3=9^3\)
\(\left(3^2\right)^5=9^5\)
\(9^8\)
\(27^6=\left(3^3\right)^6=3^{3.6}=3^{18}=3^{2.9}=\left(3^2\right)^9=9^9\)
\(81^{10}=\left(9^2\right)^{10}=9^{2.10}=9^{20}\)
Trả lời :
b)
Ta có : \(5^{28}=5^{2.14}=\left(5^2\right)^{14}=25^{14}< 26^{14}\)
\(\Rightarrow5^{28}< 26^{14}\)