Question

Tìm x:

5 mũ x+ 5 mũ x+1+5 mũ x + 2

Answer 1

5^x+5^x+1+5^x+2=?

Answer 2

5^x+5^x+1+5^x+2

=> (5^x+5^x+5^x)+1+2

= 3.5^x + 3

=> x vô nghiệm 

Answer 3

\(5^x+5^{x+1}+5^{x+2}\)

\(=5^x+5^x.5+5^x.5^2\)

\(=5^x\left(1+5+5^2\right)\)

\(=5^x.31\)

Answer 4

\(5^x+5^{x+1}+5^{x+2}=31.125\)

\(5^x+5^x.5+5^x+5^2=31.125\)

\(5^x\left(1+5+25\right)=31.125\)

\(5^x.31=31.125\)

\(\Rightarrow5^x=125\)

\(5^x=5^3\)

\(\Rightarrow x=3\)

Answer 5

5^x+5^x+1+5^x+2

=5^x+1+2