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\(a,81^3\cdot\frac{1}{9^2}:3^3=\left(9^2\right)^3\cdot\frac{1}{9^2}:3^3=9^6\cdot\frac{1}{9^2}\cdot\frac{1}{3^3}=\frac{9^6}{9^2}\cdot\frac{1}{3^3}=9^4\cdot\frac{1}{3^3}=\left(3^2\right)^4\cdot\frac{1}{3^3}=\frac{3^8}{3^3}=3^5\)
\(b,625^4:25^2=\left(5^4\right)^4:\left(5^2\right)^2=5^{16}:5^4=5^{12}\)
a, \(3^{15}:3^5=3^{15-5}=3^{10}\)
b, \(4^6:4^6=4^{6-6}=4^0\)
c, \(9^8:3^2=9^8:9=9^{8-1}=9^7\)
a, \(3^5.4^5=\left(3.4\right)^5=12^5\)
b, \(8^5.2^3=8^5.8=8^6\)
a)
\(3^5.4^5=\left(4.3\right)^5=12^5\)
b)
\(8^5.2^3=\left(2^3\right)^5.\left(2^3\right)^1=\left(2^3\right)^6=2^{18}\)
a)\(4^3.2^4\div\left(4^2.\frac{1}{32}\right)\)
\(=\left(2^2\right)^3.2^4\div\left(2^2\right)^2\div32\).
\(=2^{\left(2.3\right)}.2^4\div2^{\left(2.2\right)}\div2^5\)
\(=2^6.2^4\div2^4\div2^5\)
\(=2^{6+4-4-5}=2^1\)
b)\(\left(\frac{1}{5}\right)^5=\frac{1}{5^5}=\left|5^5\right|=5^{-5}\)
\(\frac{1}{125}=\frac{1}{5^3}=\left|5^3\right|=5^{-3}\)
c)\(\frac{4}{25}=\frac{2^2}{5^2}=\left(\frac{2}{5}\right)^2=0,4^2\)
\(\frac{-8}{125}=\frac{-2^3}{5^3}=\left(\frac{-2}{5}\right)^2=-0,4^3=0,4^{-3}\)
\(\frac{16}{625}=\frac{2^4}{5^4}=\left(\frac{2}{5}\right)^4=0,4^4\)
Viết kết quả phép tính dưới dạng một lũy thừa :
a) 53.56 = 53+6 = 59
b) 34.3 = 34+1 = 35
\(81^3\cdot\frac{1}{9^2}:3^3\)
\(=\left(9^2\right)^3\cdot\frac{1}{9^2}:3^3\)
\(=9^6\cdot\frac{1}{9^2}:3^3\)
\(=9^4:3^3\)
\(=3^8:3^3=3^5\)
=(3^4)3/(3^2)2:3^3
=3^12/3^4:3^3
=3^5