Răspuns:
[tex]\boldsymbol{ \red{\dfrac{3}{7} }}[/tex]
Explicație pas cu pas:
Suma fracțiilor:
[tex]\dfrac{2}{7}+\dfrac{4}{7}= \dfrac{2+4}{7} = \dfrac{6}{7}[/tex]
Diferența:
[tex]\dfrac{6}{7} - \dfrac{3}{7} = \dfrac{6-3}{7} = \dfrac{3}{7}[/tex]
sau:
[tex]\bigg(\dfrac{2}{7}+\dfrac{4}{7}\bigg) - \dfrac{3}{7} = \dfrac{2+4}{7} - \dfrac{3}{7} = \dfrac{6}{7} - \dfrac{3}{7} = \dfrac{6-3}{7} = \dfrac{3}{7}[/tex]
