Câu hỏi 3Khẳng định nào sau đây đúng?$10^{30}\gt 40^{15}\gt 30^{20}$$30^{20}\gt 10^{30}\gt 40^{15}$$10^{30}\gt 30^{20}\gt 40^{15}$$30^{20}\gt 40^{15}\gt 10^{30}$$40^{15}\gt 30^{20}\gt 10^{30}$