(625-1 mũ 3).(625-2 mũ 3).(625-3 mũ 3)....(625-2015 mũ 3)
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a) Ta có: \(3^{54}=\left(3^6\right)^9=729^9\)
Lại có: \(2^{81}=\left(2^9\right)^9=512^9\)
Ta có: \(729^9>512^9\Rightarrow3^{54}>2^{81}\)
b) Ta có: \(5\cdot125\cdot625=5^1\cdot5^3\cdot5^4=5^8\)
Lại có: \(625^3=\left(5^4\right)^3=5^{12}\)
Ta có: \(5^8< 5^{12}\Rightarrow5\cdot125\cdot625< 625^3\)
c) Xét: \(8^4\cdot16^3\cdot32\)
\(=\left(2^3\right)^4\cdot\left(2^4\right)^3\cdot2^5\)
\(=2^{12}\cdot2^{12}\cdot2^5\)
\(=2^{29}\)
Xét: \(64^4\cdot8^2\)
\(=\left(2^6\right)^4\cdot\left(2^3\right)^2\)
\(=2^{24}\cdot2^6\)
\(=2^{30}\)
Ta có: \(2^{29}< 2^{30}\Rightarrow8^4\cdot16^3\cdot32< 64^4\cdot8^2\)
\(\dfrac{9^{14}\cdot25^5\cdot8^7}{18^2\cdot625^3\cdot24^3}\)
\(=\dfrac{3^{42}\cdot5^{10}\cdot2^{21}}{2^2\cdot3^4\cdot5^{12}\cdot2^9\cdot3^3}=\dfrac{3^{42}\cdot5^{10}\cdot2^{21}}{2^{11}\cdot3^7\cdot5^{12}}\)
\(=\dfrac{3^{35}}{5^2}\cdot2^{10}\)
Ta đặt : \(A=1^2+2^2+3^2+...+12^2=625\)
\(\Rightarrow2A=2^2+4^2+6^2+...+24^2\)
\(\Leftrightarrow2A=1250\)
Vì \(1^2+2^2+3^2+......+12^2=625\)
\(\Rightarrow2^2+4^2+6^2+.......+24^2\)
\(=\left(1.2\right)^2+\left(2.2\right)^2+\left(3.2\right)^2+........+\left(12.2\right)^2\)
\(=1^2.2^2+2^2.2^2+3^2.2^2+.....+12^2.2^2\)
\(=1^2.4+2^2.4+3^2.4+......+12^2.4\)
\(=4.\left(1^2+2^2+3^2+.......+12^2\right)\)
\(=4.625=2500\)
\(\frac{9^{14}\cdot25^5\cdot8^7}{18^{12}\cdot625^3\cdot24^3}=\frac{3^{28}\cdot5^{10}\cdot2^{21}}{2^{12}\cdot3^{24}\cdot5^{12}\cdot2^9\cdot3^3}=\frac{3\cdot3^{27}\cdot5^{10}\cdot2^{21}}{2^{21}\cdot3^{27}\cdot5^2\cdot5^{10}}=\frac{3}{5^2}=\frac{3}{25}\)
\(\frac{9^{14}.25^5.8^7}{18^{12}.625^3.24^3}\)
\(=\)\(\frac{3^{28}.5^{10}.2^{21}}{2^{12}.3^{24}.5^{12}.2^9.3^3}\)
\(=\)\(\frac{3.3^{27}.5^{10}.2^{21}}{2^{21}.3^{27}.5^2.5^{10}}\)
\(=\)\(\frac{3}{5^2}\)
\(=\)\(\frac{3}{25}\)
a: \(625^5=5^{20}\)
\(125^7=5^{21}\)
mà 20<21
nên \(625^5< 125^7\)
\(\dfrac{25^3.2^{10}}{16^2.625^2}=\dfrac{25^3.2^{10}}{2^8.25^2}=\dfrac{25.2^2}{1}=25.4=100.\)
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