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Răspuns :

5.
[tex] \frac{20}{3x+2} [/tex]
x=0,1,2,3,4,5

6.
[tex] \frac{2}{3} [/tex]≤[tex] \frac{a+1}{6} [/tex]<[tex] \frac{53}{60} [/tex]
40≤10a+10<53/-10
30≤10a<43
a=3,4
5) 3x+2<20
3x<18
x<6
[tex]x\in\{0,1,...5\}[/tex]
6)
[tex] ^{20)} \frac{2}{3} \leq \ \textless \ ^{10)} \frac{a+1}{6}\ \textless \ \frac{53}{60}\\ 40 \leq \ \textless \ 10a+10\ \textless \ 53|-10\\ 30\leq10a\ \textless \ 43|:10\\ 3 \leq a\ \textless \ 4,3\\ a\in\{3,4\} [/tex]