[tex]6) \\ \\ (3^2-2^3)\cdot 7^0 = \\ \\ = (9-8)\cdot 1 = \\ \\ = 1\cdot 1 = 1[/tex]
[tex]7) \\ \\ 8\times y $ $\vdots $ $ 10 \Rightarrow 8\times y \in M_{10} \Rightarrow\\ \\ \Rightarrow 8\times y\in \Big\{0,10,20,30,40,50,60,70,80,....\Big\} \Big| :8\Rightarrow \\ \\ \Rightarrow y\in \Big\{0,\dfrac{10}{8},\dfrac{20}{8},\dfrac{30}{8},\dfrac{40}{8},\dfrac{50}{8},\dfrac{60}{8},\dfrac{70}{8},\dfrac{80}{8},....\Big\} \Rightarrow \\\text{(extragem doar numerele intregi)} \\ \Rightarrow y\in \Big\{0,5,10,15,20,25,...\Big\} \Rightarrow y =5\times k,\quad k\in \mathbb_{N}[/tex]
