Răspuns :
Răspuns:
[tex] a) \: \frac{4}{x} = \frac{2}{5} \\ \\ 2x = 20 \\ \\ x = 10 \\ \\ \\ b) \: \frac{6}{7} = \frac{9}{x} \\ \\ 6x = 63 \\ \\ x = \frac{21}{2} = 0.5 = 10 \frac{1}{2} [/tex]
Răspuns:
[tex] a) \: \frac{4}{x} = \frac{2}{5} \\ \\ 2x = 20 \\ \\ x = 10 \\ \\ \\ b) \: \frac{6}{7} = \frac{9}{x} \\ \\ 6x = 63 \\ \\ x = \frac{21}{2} = 0.5 = 10 \frac{1}{2} [/tex]