cara mengubah 1 2/5 kurang 2/4

1 2/5-2/4=7/5-2/4
=28/20-10/20
=18/20

[tex]1\frac{2}{5} = \frac{7}{5} - \frac{2}{4} = \frac{28 - 10}{20} = \frac{18}{20} = \frac{9}{10} [/tex]