Răspuns :
3,(2) = [tex] \frac{32-3}{9} = \frac{29}{9} [/tex]
9,(7) = [tex] \frac{97-9}{9} = \frac{88}{9} [/tex]
[tex] \frac{29}{9} + x \ \textless \ \frac{88}{9}[/tex]
Amplificam la x cu 9 :
[tex]29+9x\ \textless \ 88[/tex] | - 29
[tex]9x \ \textless \ 88-29[/tex]
[tex]9x\ \textless \ 59[/tex]
[tex]x\ \textless \ \frac{59}{9} [/tex]
x < 6,(5)
x ∈ {0,1,2,3,4,5,6}
9,(7) = [tex] \frac{97-9}{9} = \frac{88}{9} [/tex]
[tex] \frac{29}{9} + x \ \textless \ \frac{88}{9}[/tex]
Amplificam la x cu 9 :
[tex]29+9x\ \textless \ 88[/tex] | - 29
[tex]9x \ \textless \ 88-29[/tex]
[tex]9x\ \textless \ 59[/tex]
[tex]x\ \textless \ \frac{59}{9} [/tex]
x < 6,(5)
x ∈ {0,1,2,3,4,5,6}
3,[2]+x<9,[7]
⇒32-3/9+x<97-9/9
⇒29/9+x<88/9
⇒x<88/9-29/9
⇒x<59/9⇒x<6,[5]⇒x∈N;
⇒x∈[0,1,2,3,4,5,6];
⇒32-3/9+x<97-9/9
⇒29/9+x<88/9
⇒x<88/9-29/9
⇒x<59/9⇒x<6,[5]⇒x∈N;
⇒x∈[0,1,2,3,4,5,6];