1.
A) 4/12= 5/15
4*15= 60
12*5= 60
B) 10/14= 15/21
10*21= 210
14*15= 210
C) 2/5= 12/30
2*30= 60
12*5= 60
Exercițiul 2
A) 1/9+2/3*(1/4-16)
1/9+2/3*1/12=
1/9+1/3*1/6=
1/9+1/18= (2+1)/18=
3/18= 1/6
B) 3/10-2/5*(7/10-1/5)
3/10-2/5*1/2=
3/10-1/5= (3-2)/10= 1/10
