Question

Giúp mình 2 câu này please ;)))

Answer 1

Answer 2

d:Ta có: \(3^{x+2}=270-3^x\)

\(\Leftrightarrow10\cdot3^x=270\)

\(\Leftrightarrow x=3\)

e: Ta có: \(5x-\left(3x-\dfrac{1}{2}\right)=4\dfrac{1}{2}\)

\(\Leftrightarrow2x+\dfrac{1}{2}=\dfrac{9}{2}\)

hay x=4