aflati x din propoztiile : de la e
....i va rog ajutati ma

E)
[tex] \frac{ \frac{2 \times 2 + 1}{2} }{x} = \frac{ \frac{20}{3 \times 5 + 1} }{5} [/tex]
[tex] \frac{ \frac{5}{2} }{x} = \frac{ \frac{20}{16} }{5} [/tex]
[tex]20x = \frac{5}{2} \times \frac{16}{5} \\ 20x = \frac{16}{2} [/tex]
[tex]20x = 8 \\ x = \frac{8}{20} \div 4[/tex]
[tex]x = \frac{2}{5} [/tex]

F)
[tex] \frac{x}{3} = \frac{12}{x} \\ {x}^{2} = 12 \times 3[/tex]
[tex] {x}^{2} = 36 \\ x = 36 \div 2[/tex]
[tex]x = 18[/tex]
G)
[tex] \frac{ \frac{0.3}{x} }{2} = \frac{ \frac{x}{2} }{2.7} \\ \frac{ {x}^{2} }{4} = 0.3 \times 2.7[/tex]
[tex] \frac{ {x}^{2} }{4} = 0.81 \\ \frac{ {x}^{2} }{4} = \frac{81}{100} [/tex]
[tex]100 {x}^{2} = 81 \times 4 \\ 100 {x}^{2} = 324 \\ {x }^{2} = \frac{324}{100} [/tex]
[tex]x = 3.24 \div 2 \\ x = 1.62[/tex]

H)
[tex] \frac{0.(3)}{0.1(6)} = \frac{x}{2.5} \\ 0.1(6)x = 0.(3) \times 2.5 \\ 0.1(6)x = 0.8(3)[/tex]
[tex]x = 0.8(3) \div 0.1(6) \\ x = 5[/tex]
I)
[tex] \frac{ \frac{1}{8} \times \frac{2}{5} - \frac{18}{5} \times \frac{5}{3}}{x} = \frac{ \frac{2 \times 5 + 4}{5} \times 10}{ \frac{1 \times 5 + 2}{5} - \frac{3}{5} }[/tex]

[tex] \frac{ \frac{1}{20} - 6 }{x} = \frac{ \frac{14}{5} \times 10 }{ \frac{7}{5} - \frac{3}{5} } \\ [/tex]

[tex] \frac{ \frac{1 - 120}{20} }{x} = \frac{14 \times 2}{ \frac{4}{5} } \\ \frac{ \frac{ - 119}{20} }{x} = \frac{28}{ \frac{4}{5} } [/tex]

[tex]28x = \frac{ - 119}{20} \times \frac{4}{5} \\ 28x = \frac{ - 119}{25} [/tex]

[tex]x = \frac{ - 119}{25} \times \frac{1}{28} \\ x = \frac{ - 119}{700} \\ x = - 0.17[/tex]