Răspuns:
sper ca te am ajutat! pe 2 nici eu nu stiu cum sa il fac..
Explicație pas cu pas:
ex. 3
a)
[tex] \frac{1}{3} - \frac{3}{4} + \frac{5}{6} = \frac{4 - 9 + 10}{12} = \frac{5}{12} [/tex]
b)
[tex] \frac{3}{5} - \frac{4}{15} + \frac{2}{3} = \frac{9 - 4 + 10}{15} = \frac{15}{15} = 1[/tex]
c)
[tex] - \frac{1}{2} + \frac{7}{3} - \frac{5}{6} = \frac{ - 3 + 14 - 5}{6} = \frac{6}{6} = 1[/tex]
d)
[tex] \frac{5}{8} - \frac{1}{3} + \frac{7}{6} = \frac{15 - 8 + 28}{24} = \frac{35}{24} [/tex]
e)
[tex] \frac{1}{4} - \frac{1}{3} + \frac{1}{6} = \frac{3 - 4 + 2}{12} = \frac{1}{12} [/tex]
f)
[tex] \frac{2}{3} + \frac{5}{4} - \frac{17}{12} = \frac{8 + 15 - 17}{12} = \frac{6}{12} = \frac{1}{2} [/tex]
ex.4
a)
[tex] \frac{1}{3} - \frac{2}{3} = \frac{1 - 2}{3} = - \frac{1}{3} [/tex]
b)
[tex] - \frac{1}{3} + ( - \frac{2}{3} ) = - \frac{1}{3} - \frac{2}{3} = - 1[/tex]
c)
[tex] - \frac{1}{3} - ( - \frac{2}{3} ) = - \frac{1}{3} + \frac{2}{3} = \frac{1}{3} [/tex]
d)
[tex] \frac{1}{5} + ( - \frac{3}{15} ) = \frac{1}{5} - \frac{3}{15} = 0[/tex]
e)
[tex] - \frac{1}{2} + ( - \frac{3}{8} ) = - \frac{1}{2} - \frac{3}{8} = - \frac{7}{8} [/tex]
f)
[tex] - \frac{1}{5} - ( - \frac{7}{10} ) = - \frac{1}{5} + \frac{7}{10} = \frac{1}{2} [/tex]
