15целых 2/10-10целых 9/10помогите

[tex]15 \frac{2}{10} -10 \frac{9}{10} = \frac{152}{10} - \frac{109}{10} = \frac{43}{10} =4 \frac{3}{10} =4,3[/tex]

15.2-10.9=5.2-0.9=4.3