Răspuns :
(- 2[tex]\frac{3}{4}[/tex] + 1[tex]\frac{1}{6}[/tex] ) + ( -1 [tex]\frac{2}{3}[/tex] + 2\frac{7}{12} ) = ( - \frac{11}{4} + \frac{7}{6} ) + ( -\frac{5}{3} + \frac{31}{12}) = \frac{14+31-33-20}{12} = \frac{14-22}{12} = -\frac{8}{12} = - \frac{2}{3}
c)
-11/4 + 7/6 - 5/3 + 31/12 =
(-11×3+7×2-5×4+31)/12 =
(-33+14-20+31)/12 =
-8/12 =
-2/3
-11/4 + 7/6 - 5/3 + 31/12 =
(-11×3+7×2-5×4+31)/12 =
(-33+14-20+31)/12 =
-8/12 =
-2/3