x.(-3/4)mũ 6=(3/4)mũ 8

Ta có \( x.\left( \frac{-3}{4} \right)^6=\left( \frac{3}{4} \right)^8 \) Ta thấy \( \left( \frac{-3}{4} \right)^6=\left( \frac{3}{4} \right)^6 \) Do đó \( x.\left( \frac{3}{4} \right)^6=\left( \frac{3}{4} \right)^8 \) Nhận xét: \( \left( \frac{3}{4} \right)^6 \neq 0 \) Ta có \( x=\left( \frac{3}{4} \right)^8:\left( \frac{3}{4} \right)^6=\left( \frac{3}{4} \right)^2=\frac{9}{16} \) Vậy \( x=\frac{9}{16} \).