X : \frac{9}{10} = 1
x · \frac{10}{9} = 1
\frac{10}{9}x = 1
x = \frac{9}{10} (x = 0.9)
x : 19 = \frac{16}{19}
\frac{x}{19} = \frac{16}{19}
x = 16
x : 3 = \frac{5}{9}
\frac{x}{3} = \frac{5}{9}
9x = 15
x = \frac{5}{3} (x = 1 \frac{2}{3}, x ≈ 1.66667)
x · \frac{1}{4}x = 4
\frac{1}{4}x = 4
x = 16
x : \frac{7}{13} = 1
x · \frac{13}{7} = 1
\frac{13}{7}x = 1
x = \frac{7}{13}
x : \frac{2}{18} = 18
x · \frac{18}{2} = 18
x · 9 = 18
9x = 18
x = 2
x : 10 = \frac{1}{25}
\frac{x}{10} = \frac{1}{25}
25x = 10
x = \frac{2}{5} (x = 0.4)
x : \frac{3}{10} =2
x · \frac{10}{3} = 2
\frac{10}{3}x = 2
x = \frac{3}{5} (x = 0.6)