stim ca multimea Q reprezinta numerele rationale, adica fractiile
a) 5- 2x = 5/10
5- 1/2 = 2x
9/2 = 2x
x = 9/4
b) 36/10x = 12/10
12* 10x = 10* 36
10 x = 10*36/12
x = 10*36 / 10*12
x = 36/12
x =3
c) 23/10x + 12/10x = 7
23 + 12 = 7 * 10x
35 = 7* 10x
35 = 70x
x = 35/70
x = 1/2
