[tex] \frac{x}{7} \times \frac{x}{2} = 2x \times 7x = 14 {x}^{2} [/tex]
[tex] \frac{18}{5} \times \frac{x}{x} = 9 \\ 18x \times 5x = 9 \\ 90 {x}^{2} = 9 \\ {x}^{2} = \frac{9}{90} = \frac{1}{10} \\ x = \sqrt{ \frac{1}{10} } \\ x = \frac{ \sqrt{10} }{10} [/tex]
la prima nu am ce sa fac mai mult
