Question

14.7 mũ 2021=35.7 mũ 2021-3.49 mũ x .Tìm x thuộc Z

Answer 1

\(14.7^{2021}=35.7^{2021}-3.49^x\)

\(\Leftrightarrow2.7^{2022}=5.7^{2022}-3.7^{2x}\)

\(\Leftrightarrow3.7^{2x}=3.7^{2022}\) \(\Leftrightarrow7^{2x}=7^{2022}\)

\(\Leftrightarrow2x=2022\Leftrightarrow x=1011\) (TM \(x\in Z\))

Vậy \(x=1011\)