1.
a.
[tex] \frac{3}{4}; \frac{3}{5}; \frac{3}{3} ; \frac{4}{3}; \frac{4}{4} ; \frac{4}{5}; \frac{5}{3}; \frac{5}{4}; \frac{5}{5} [/tex]
b.
[tex] \frac{7}{4} ; \frac{8}{4} ; \frac{8}{7} [/tex]
b.
[tex] \frac{7}{13} + \frac{5}{13} [/tex]
[tex] \frac{7 + 5}{13} [/tex]
[tex] \frac{12}{13} [/tex]
d.
[tex] \frac{21}{6} - \frac{9}{6} [/tex]
[tex] \frac{21 - 9}{6} [/tex]
[tex] \frac{12}{6} [/tex]
[tex]2[/tex]
2.
b.
[tex] \frac{n + 1}{12} = \frac{5}{3} [/tex]
[tex]3 \times (n + 1) = 60[/tex]
[tex]n + 1 = 20[/tex]
[tex]n = 20 - 1[/tex]
[tex]n = 19[/tex]
c.
[tex] \frac{61}{35} - \frac{2x}{35} = \frac{19}{35} + \frac{22}{35} [/tex]
[tex] \frac{61}{35} - \frac{2x}{35} = - \frac{3}{35} [/tex]
[tex]61 - 2x = - 3[/tex]
[tex] - 2x = - 3 - 61[/tex]
[tex] - 2x = - 64[/tex]
[tex]x = 32[/tex]
3.
a.
[tex]480 \times \frac{5}{100} = \frac{2400}{100} = 24 \\ lei \: \: reducerea [/tex]
[tex]480 - 24 = 456 \: \: lei \: \: \: costa[/tex]
