ma poate ajuta cineva la cele 3 exercitii?
1)
[tex] \frac{5 \times }{4} = \frac{20}{ \times } [/tex]
2)
[tex] \frac{ \times }{2} = \frac{4 - 3 \times - { \times }^{2} }{2 \times - 6} [/tex]
3)
[tex] \frac{9 - \times }{16} = 1[/tex]

​