1) 1/5 ; 3/7 ; 23/24 si 56/63.....=> fractii subunitare...=> d)4
2) 5)
7 35
---- = ---- = 1,4 => am amplificat cu 5 ....=> d) 35/25
5 25
3) (60/45):5 =12/9 => am simplificat cu 5.....=> a) 12/9
4) 1/2<7/12<2/3.........=> b) 7/12
1 5 11 11
5) 2--- - (---- + ---- ) = ----
4 12 12 12
1 5 11
(2+ ---) - ( ---- + ----- )
4 12 12
5+11 16 4
=> -------- = ---- = ----
12 12 3
1 4 2 2*4
(2+----) - ----- => 2= ---- = -------
4 3 1 4
2*4+1 9
=> ---------- = ----
4 4
9 4 9*3-(4*4) 27-16 11
=> --- - ----- = ----------------- = ---------- = -----
4 3 12 12 12
=> raspuns ...c) 11/12
6) 5 25 6 4 8 5
---- : ------ + ---- x (---- - ------)= ----
12 9 5 6 18 12
5 25 6 4 4
---- : ----- + (--- x ( ---- - ----- )
12 9 5 6 9
5 25 6 2 4
---- : ---- + (--- x ( --- - ----)
12 9 5 3 9
2*3-(4) 2
=> ---------- = ---
9 9
5 25 6 2
---- : ----- + (---- x ----) =
12 9 5 9
5 25 4
= ---- : ---- + ----
12 9 15
5 25 5 9
=> ---- : ------ = ---- x ----
12 9 12 25
30 4
------ + -----
20 15
3*3+4*4 5
--------------- = ----
60 12
=> raspuns: b) 5/12
