Bài 1:
1: \(=\dfrac{5^9}{5^3}=5^6\)
2: \(=3^{18}\cdot3^3=3^{21}\)
3: \(=5^{60}\cdot5^{30}=5^{90}\)
4: \(=\dfrac{2^{20}}{2^{18}}=2^2\)
Bài 1
\(1,=5^{15}:5^3=5^{12}\\ 2,=3^{18}.3^3\\ =3^{21}\\ 3,=5^{60}.5^{30}=5^{90}\\ 4,=2^{20}:2^{18}=2^2=4\)
a)125^5:5^3= 5^15:5^3=5^12
tương tự như cách trên:
b) 3^15
c)5^90