1 supra 7, 1 supra 12, 12 supra 8, 4 supra 7, 10 supra 4, 20 supra 13.
sper ca e bine
Răspuns:
3/7+2/7-4/7=
5/7-4/7=
1/7
9/12-6/12+4/12=
3/12+4/12=
7/12
1(8/8)-2/8+6/8=
8/8-2/8+6/8=
6/8+6/8=
12/8
1-(2/7+4/7-3/7)=
7/7-(2/7+4/7-3/7)=
7/7-(6/7-3/7)=
7/7-3/7=
4/7
2-(7/13+2/13-3/13)=
26/13-(7/13+2/13-3/13)=
26/13-(9/13-3/13)=
26/13-6/13=
20/13
