[tex] a)\frac{4}{7} = \frac{12}{21} [/tex]
[tex]b) \frac{4}{7} = \frac{28}{49} [/tex]
[tex]c) \frac{4}{7} = \frac{36}{63} [/tex]
[tex]d) \frac{4}{7} = \frac{40000}{70000} [/tex]
Sper că te-am ajutat!Succes!