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a: \(A=8^2\cdot32^4=2^6\cdot2^{20}=2^{26}\)
b: \(B=27^3\cdot9^4\cdot243=3^9\cdot3^8\cdot3^5=3^{22}\)
\(A=1+3+3^2+...+3^{41}\)
\(3A=3+3^2+3^3+...+3^{42}\)
\(3A-A=3+3^2+...+3^{42}-1-3-...-3^{41}\)
\(2A=3^{42}-1\)
\(A=\dfrac{3^{42}-1}{2}\)
Ta có: \(2A+1\)
\(=2\cdot\dfrac{3^{42}-1}{2}+1\)
\(=3^{42}-1+1\)
\(=3^{42}\)
\(=\left(3^2\right)^{21}\)
\(=9^{21}\)
a: \(A=\left(2^3\right)^2\cdot\left(2^5\right)^4=2^6\cdot2^{20}=2^{26}\)
b: \(=\left(3^3\right)^3\cdot\left(3^2\right)^4\cdot3^5=3^9\cdot3^8\cdot3^5=3^{22}\)
\(A=8^2.32^4=\left(2^3\right)^2.\left(2^5\right)^4=2^6.2^{20}=2^{26}\)
\(B=27^3.9^4.243=\left(3^3\right)^3.\left(3^2\right)^4.3^5=3^9.3^8.3^5=3^{22}\)
\(16^2:4^2\)
\(=\left(4^2\right)^2:4^2\)
\(=4^4:4^2\)
\(=4^{4-2}\)
\(=4^2\)
==========
\(25^5:5^2\)
\(=\left(5^2\right)^5:5^2\)
\(=5^{10}:5^2\)
\(=5^{10-2}\)
\(=5^8\)
============
\(9^8:3^2\)
\(=\left(3^2\right)^8:3^2\)
\(=3^{16}:3^2\)
\(=3^{16-2}\)
\(=3^{14}\)
===========
\(a^6:a\)
\(=a^{6-1}\)
\(=a^5\)
42.83 = (22)2.(23)3 = 24.29 = 213
93.272 = (32)3.(33)2 = 36.36 = 312
82.253 = (23)2.(52)3 = 26.56 = (2.5)6 = 106
a.
\(a^2\),\(4^3,8^2\)
B
\(a^3\),\(9^2,254^1\)
C
\(a^2\)và \(a^3\),\(54^2,36^3,48^4\)