ex.5 va rog frumos!!!!

Explicație pas cu pas:
a. 18/49= 3/7×6/7
b.15/28= 3/7×5/4
c.1/8= 1/4×1/2
d.5/7= 1/1× 5/7
[tex]\bf \dfrac{18}{49}=\dfrac{2}{7}\cdot\dfrac{9}{7}\\ \\ \\ \dfrac{15}{28}=\dfrac{3}{4}\cdot\dfrac{5}{7}\\ \\ \\ \dfrac{1}{8}=\dfrac{1}{2}\cdot\dfrac{1}{4}\\ \\ \\ \dfrac{5}{7}=\dfrac{1}{1}\cdot\dfrac{5}{7}[/tex]