[tex] \huge{\blue{IMPORTANT:}} [/tex]
[tex] \blue{ \boxed{\frac{a}{b} > \frac{a}{c} \rightarrow \: b < c}}[/tex]
[tex] \blue{ \boxed{\frac{a}{b} > \frac{c}{b} \rightarrow \: a > c}}[/tex]
9)
b)
[tex] \frac{19}{12} > \frac{19}{14} > \frac{19}{15} > \frac{19}{16} > \frac{19}{17} > \frac{19}{18} > \frac{19}{19} [/tex]
10)
b) Pentru a putea compara fracțiile trebuie sa le aducem la același numitor.
[tex] {}^{4)} \frac{n + 1}{7} < {}^{7)} \frac{5}{4} \\ \frac{4n + 4}{28} < \frac{35}{28} [/tex]
4n + 4 < 35
4n < 35 - 4
4n < 31
n < 31/4
n < 7 3/4
n natural nenul
n = { 1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7 }
