Răspuns :
a)
[tex] \frac{2}{3} = \frac{x}{9} \\ 2 \times 9 = 3x \\ 18 = 3x \\ x = \frac{18}{3} \\ x = 6 \\ b \\ \frac{5}{x} = \frac{10}{20} \\ 100 = 10x \\ x = \frac{100}{10} \\ x = 10 \\[/tex]
c) x/8=1/2
2x=8
x=8/2
x=4
d) 10/5=x/2
5x=20
x=20/5
x=4
a)
[tex] \frac{2}{3} = \frac{x}{9} \\ 2 \times 9 = 3x \\ 18 = 3x \\ x = \frac{18}{3} \\ x = 6 \\ b \\ \frac{5}{x} = \frac{10}{20} \\ 100 = 10x \\ x = \frac{100}{10} \\ x = 10 \\[/tex]
c) x/8=1/2
2x=8
x=8/2
x=4
d) 10/5=x/2
5x=20
x=20/5
x=4