Question

Answer 1

\(\Leftrightarrow3^x\left(3-2\right)=243\\ \Leftrightarrow3^x=243=3^5\\ \Leftrightarrow x=5\)

Answer 2

\(3^{x+1}-2.3^x=243\\ \Leftrightarrow3^x.\left(3-2\right)=243\\ \Leftrightarrow3^x=243\\ Mà:3^5=243\\ \Rightarrow3^x=3^5\\ \Rightarrow x=5\)

Answer 3

<=>3^x.3-2.3^x=243

<=>3^x(3-2)=243

<=>3^x=3⁵

=>x=5

Vậy x=5

Answer 4

⇔ cái này nghĩa là sao ạ mn?