Question

Va rog ajutați ma ! ​

Answer 1

$\it10x-\dfrac{1}{3}=1\ \Big|_{\cdot3}\ \Rightarrow 30x-1=3\ \Big|_{+1}\ \Rightarrow 30x=4\ \Big|_{:4}\ \Rightarrow x=\dfrac{\ 4^{(2}}{30}=\dfrac{2}{15}\ \Rightarrow \\ \\ \\ \ \Rightarrow A=\Big\{\dfrac{2}{15}\Big\}$

$\it -4,5x-1=\dfrac{7}{2}\ \Rightarrow -4,5x-1=3,5\ \Big|_{+1}\ \Rightarrow -4,5x=4,5\ \Big|_{:(-4,5)}\ \Rightarrow \\ \\ \\ \ \Rightarrow x=-1\not\in\mathbb{N}\ \Rightarrow D=\varnothing$