Question

[Barbie Girl]

Tìm số tự nhiên x biết 

4^x=64

15^x=225

3^x :9 = 27

X²⁰¹⁸=0

X⁵⁰=x

3^x:9=27

300^x=1

12^x=144

Answer 1

[Hoàng Ninh]

\(4^x=64\)

\(\Rightarrow x=3\)

\(15^x=225\)

\(\Rightarrow x=2\)

\(3^x:9=27\)

\(\Leftrightarrow3^x=243\)

\(\Leftrightarrow x=5\)

\(x^{2018}=0\)

\(\Leftrightarrow x=0\)

\(x^{50}=x\)

\(\Rightarrow x\in\left\{0;1\right\}\)

\(300^x=1\)

\(\Rightarrow x=0\)

`\(12^x=144\)

\(\Rightarrow x=2\)

Answer 2

[kudo shinichi]

4^x=64=4³=> x=3

15^x=225=15²=> x=2

3^x :9 = 27

3^x=3³x3²=3⁵=> x=5

X²⁰¹⁸=0=> x=0

X⁵⁰=x=> x=1 hoặc 0

300^x=1=> x=0

12^x=144=12²=> x=2