Răspuns:
Explicație pas cu pas:
0,2= 2/10 SIMPLIFIC =1/5
0,5=5/10 SIMPLIF=1/2
1/5+1/2-1/3=ADUCEM LA ACELASI NUMITOR ADICA 30
6/30+15/30-10/30=21/30-10/30=11/30
0,25=25 /100 simpl cu 25=1/4
1/7=17/10
0,2=2/10simplif cu2=1/5
1/4-1/7+1/5=cauti numitorul comun si amplifici
0,5=1/2
1,4=7/5
1/2+7/5x(4/6+1/6)=1/2+7/5x5/6
1/2+7/6=amplificam cu3 =3/6+7/6=10/6 simplific cu2=5/3
