Question

2+1 -2- 4
5  4  10 15
 eXPressao

Answer 1

$\boxed{\frac{2}{5} - \frac{1}{4} -\frac{2}{10} - \frac{4}{15} = \frac{24- 15-12-16}{60}= - \frac{19}{60}}$

Answer 2

2/5 + 1/4 -2/10-4/15=
fAZENDO MMC , OBTEMOS 60

   60:5.2 + 60:4.1;-60:10.-2-60:15.-4
______________________________=24+15-12-16=-19/60
                 60