Question

25/12+(-1intreg si 2/9)-7/4

Answer 1

$\frac{25}{12} - \frac{11}{9} - \frac{7}{4} (aducem \frac{25}{12} si \frac{7}{4} la acelasi numitor 12 si => \textgreater \ )$
$\frac{25}{12} - \frac{11}{9} - \frac{7}{4} = \frac{4}{12}- \frac{11}{9} \frac{4}{12} se simplifica cu 4 si ramane \frac{1}{3}$
si acum ducem la acelasi numitor adica 9 ,  \frac{11}{9}  si \frac{1}{3}
$\frac{3}{9} - \frac{11}{9} = - \frac{8}{9}$

Answer 2

25/12-11/9-7/4=(25x3-11x4-7x9)/36=(75-44-63)/36=-32/36 (simplificam cu 4)=-8/9
sau 
1intreg 2/9=(1x9+2)/9=11/9
25/12-11/9-7/4=
pt a aduce la acelasi numitor calculam cel mai mic multiplu comun
12=3x2²
9=3²
4=2²
[12,9,4]=3²x2²=36
deci numitorul comun este 36
36:12=3 deci cu 3 amplificam I fractie
36:9=4 deci cu 4 amplificam II fractie
36:4=9 deci cu 9 amplificam a treia fractie