Question

Rezolvati in multimea Q ecuatia si efectuati verificare
(4×-1):3=-1pe3
7pe9×-2pe3×=2
-3.(2-15×)=-6

Answer 1

b) 4X - 1 = -1/3 x 3
   4X - 1 = -1
   4X = 0
   X = 0
Proba: ( 4 x 0 - 1 ) : 3 = - 1 : 3 = - 1/3

c) 7X - 6X = 18
   X = 18
Proba: 7/9 x 18 - 2/3 x 18 = 14 - 12 = 2

d) - 6 + 45X = -6
    45X = -6 + 6
     X = 0
Proba: - 3 ( 2 - 15 x 0 ) = -3 ( 2 - 0 ) = - 3 x 2 = - 6