Question

3intregi 1 supra 10-1 intreg 2supra 5

Answer 1

$3 \frac{1}{10} -1 \frac{2}{5} = \frac{31}{10} - \frac{7}{5} = \frac{31-14}{10}= \frac{17}{10}$

Answer 2

introducem in fractie intregii,astfel obtinand:
3x10+1-1x5+7=31/10-7/5
aducem la acelasi numitor amplificand a doua fractie cu doi:
31/10-14/10=17/10