\(a,\)\(\text{Ta có: }\) \(3^{200}=\left(3^2\right)^{100}=9^{100}\left(1\right)\)
\(2^{300}=\left(2^3\right)^{100}=8^{100}\left(2\right)\)
\(\text{Từ (1) và (2) }\)\(\Rightarrow3^{200}>2^{300}\)
a, 3^200= (3^2)^100= 9^100
2^300= (2^3)^100= 8^100
Vì 9^100>8^100 nên 3^200>2^300
b, 125^5= (5^3)^5= 5^15
25^7= (5^2)^7= 5^14
Vì 5^15>5^14 nên 125^5>25^7