Question

tính:

\(a.9^x:3^x=3^7\)

b.\(\frac{1}{2}.2^x+2^{x+2}=2^8+2^5\)

c\(^{7^{x+2}+2.7^{x-1}=345}\)

d \(\left(\frac{1}{2}-\frac{1}{3}\right).6^x+6^{x+2}=6^7+6^4\)

Answer 1

\(9^x:3^x=3^7\)

\(\Rightarrow9:3^x=3^7\)

\(\Rightarrow3^x=3^7\)

\(\Rightarrow x=7\)

Answer 2

9^x : 3^x = 3⁷

=> 9 : 3^x = 3⁷

=> 3^x = 3⁷

=> x = 7

Answer 3

9^x ÷ 3^x = 3⁷

=> 9 ÷ 3^x = 3⁷

=> 3^x = 3⁷

=> x = 7