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) \(\Rightarrow x=\left(-\dfrac{1}{3}\right)\left(-\dfrac{1}{3}\right)^3=\left(-\dfrac{1}{3}\right)^4=\dfrac{1}{81}\)

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) \(\Rightarrow\left(-\dfrac{3}{4}\right)^{3x-1}=\left(-\dfrac{3}{4}\right)^3\)

\(\Rightarrow3x-1=3\Rightarrow3x=4\Rightarrow x=\dfrac{4}{3}\)