Răspuns:
ex 1
[tex] \frac{2}{5} + \frac{1}{5} = \frac{3}{5} [/tex]
[tex] \frac{7}{9} + \frac{2}{9} = \frac{9}{9} [/tex]
[tex] \frac{20}{100} + \frac{60}{100} [/tex]
[tex] \frac{3}{9} + \frac{2}{9} + \frac{2}{9} = \frac{7}{9} [/tex]
[tex] \frac{2}{3} + \frac{2}{3} + \frac{2}{3} = \frac{6}{3} [/tex]
[tex] \frac{8}{10} - \frac{2}{10} = \frac{6}{10} [/tex]
[tex] \frac{10}{8} - \frac{5}{8} = \frac{5}{8} [/tex]
[tex] \frac{80}{100} - \frac{30}{100} = \frac{50}{100} [/tex]
[tex] \frac{18}{10} - \frac{4}{10} - \frac{6}{10} = \frac{8}{10} [/tex]
[tex] \frac{3}{7} + \frac{3}{7} - \frac{2}{7} = \frac{4}{7} [/tex]
ex 2
a)
[tex] \frac{7}{8} + \frac{1}{8} = \frac{8}{8} [/tex]
[tex] \frac{7}{8} + \frac{3}{8} = \frac{10}{8} [/tex]
[tex] \frac{7}{8} + \frac{2}{8} = \frac{9}{8} [/tex]
[tex] \frac{7}{8} + \frac{6}{8} = \frac{13}{8} [/tex]
[tex] \frac{4}{8} + \frac{5}{8} = \frac{9}{8} [/tex]
[tex] \frac{7}{8} + \frac{7}{8} = \frac{14}{8} [/tex]
b)
[tex] \frac{9}{9} - \frac{3}{9} = \frac{6}{9} [/tex]
[tex] \frac{5}{9} - \frac{3}{9} = \frac{2}{9} [/tex]
[tex] \frac{6}{9} - \frac{3}{9} = \frac{3}{9} [/tex]
[tex] \frac{4}{9} - \frac{3}{9} = \frac{1}{9} [/tex]
[tex] \frac{7}{9} - \frac{3}{9} = \frac{4}{9} [/tex]
[tex] \frac{8}{9} - \frac{3}{9 } = \frac{5}{9} [/tex]
ex 3
[tex] \frac{9}{10} = \frac{5}{10} + \frac{4}{10} [/tex]
[tex] \frac{6}{7} = \frac{5}{7} + \frac{1}{7} [/tex]
[tex] \frac{8}{9} = \frac{2}{9} + \frac{6}{9} [/tex]
[tex] \frac{2}{2} = \frac{1}{2} + \frac{1}{2} [/tex]
ex 4
nu stiu
