Question

mọi người giúp mình với ạ , mình cảm ơn

Answer 1

\(a,\Rightarrow-\dfrac{2}{3}x=-\dfrac{10}{3}\Rightarrow x=5\\ b,\Rightarrow x=\left(-\dfrac{1}{3}\right)\cdot\left(-\dfrac{1}{3}\right)^3=\left(-\dfrac{1}{3}\right)^4=\dfrac{1}{81}\\ c,\Rightarrow\left|x+0,8\right|=12,9\\ \Rightarrow\left[{}\begin{matrix}x+0,8=12,9\\x+0,8=-12,9\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=12,1\\x=-13,7\end{matrix}\right.\\ d,\Rightarrow\left(-\dfrac{3}{4}\right)^{3x-1}=\left(-\dfrac{3}{4}\right)^3\\ \Rightarrow3x-1=3\\ \Rightarrow3x=4\Rightarrow x=\dfrac{4}{3}\)