completeaza cu numere potrivite​

a) 2 + 2

2 - 1

b) 2 + 3 = 5 pe 6

c) 0 + 4

0+9

d) aduci la acelasi numitor = 5 - 1 totul supra 5 = 4 pe 5

a)
[tex] \frac{1}{5} + \frac{3}{5} = \frac{4}{5} \\ \frac{2}{5} + \frac{2}{5} = \frac{4}{5} [/tex]
[tex] \frac{7}{7} - \frac{6}{7} = \frac{1}{7} \\ \frac{6}{7} - \frac{5}{7} = \frac{1}{7 } \\ \frac{5}{7} - \frac{4}{7} = \frac{1}{7} \\ \frac{4}{7} - \frac{3}{7} = \frac{1}{7} \\ \frac{3}{7} - \frac{2}{7} = \frac{1}{7} \\ \frac{2}{7} - \frac{1}{7} = \frac{1}{7} [/tex]
b)
[tex] \frac{1}{6} + \frac{4}{6} = \frac{5}{6} \\ \frac{2}{6} + \frac{3}{6} = \frac{5}{6} [/tex]
[tex] \frac{9}{8} - \frac{6}{8} = \frac{3}{8} [/tex]

c)
[tex] \frac{1}{4} + \frac{3}{4} = \frac{4}{4} = 1 \\ \frac{2}{4} + \frac{2}{4} = \frac{4}{4} = 1[/tex]
[tex] \frac{1}{9} + \frac{8}{9} = \frac{9}{9 } = 1 \\ \frac{2}{9} + \frac{7}{9} = \frac{9}{9} = 1 \\ \frac{3}{9} + \frac{6}{9} = \frac{9}{9} = 1 \\ \frac{4}{9} + \frac{5}{9} = \frac{9}{9} = 1[/tex]
d)
[tex]1(5 - \frac{1}{5} = \\ \frac{5}{5} - \frac{1}{5} = \frac{4}{5} \\ \frac{5}{5} - \frac{2}{5} = \frac{3}{5} \\ \frac{5}{5} - \frac{3}{5} = \frac{2}{5} \\ \frac{5}{5} - \frac{4}{5} = \frac{1}{5} [/tex]


[tex]1(7 - \frac{6}{7} = \\ \frac{7}{7} - \frac{6}{7} = \frac{1}{7} \\ \frac{7}{7} - \frac{5}{7} = \frac{2}{7} \\ \frac{7}{7} - \frac{4}{7} = \frac{3}{7} \\ \frac{7}{7} - \frac{3}{7} = \frac{4}{7} \\ \frac{7}{7} - \frac{2}{7} = \frac{5}{7} \\ \frac{7}{7} - \frac{1}{7} = \frac{6}{7} [/tex]