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Aflati x:

a) 2x - 1 aparine D12
b) x + 3 | 2x + 15


Răspuns :

D12={1;2;3;4;6;12}
2x-1=1
2x=2
x=1
2x-1=2
x=[tex] \frac{3}{2} [/tex]
2x-1=3
2x=4
x=2
2x-1=6
2x=7
x=[tex] \frac{7}{2} [/tex]
2x-1=12
x=
[tex] \frac{13}{2} [/tex]
b)
x+3=2x+15
x-2x=12
-x=12
x=-12