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fracciones equivalentes

[tex] \frac{3}{7} = \frac{?}{35} [/tex]


[tex] \frac{2}{9} = \frac{18}{?} [/tex]


[tex] \frac{1}{2} = \frac{?}{2} [/tex]


[tex] \frac{7}{15} = \frac{?}{45} [/tex]


[tex] \frac{30}{18} = \frac{5}{?} = \frac{?}{21} [/tex]