a,
625^5=(125.5)^5=125^5.5^5
125^7 =125^5 . 5^2
Vì 5^5 > 5^2
=> 625^5 > 125^7
3^(2n) = 3^2 . 3^n =9.3^n
2^(3n)=2^3.2^n=8.2^n
Vì 9.3^n > 8.2^n
=> 3^(2n)>2^(3n)
D,
6.5^24 > 5.5^24=5^25
=> 6.5^24 > 5^25
E,
11^21 = 11^2 . 11^13 . 11^6 > 3^2 . 2^13=9.2^13
=> 9.2^13 < 11^21
G,
7^50= (7^2)^25=49^25
3^75=(3^3)^25=9^25
Vì 49^25 > 9^25 => 7^50 > 3^75
3^39 = (3^13)^3=1594323^3
11^21= (11^7)^3= 19487171^3
=> 3^39 < 11^21