1) Rezolvati ecuatiile in multimea numerelor naturale :
a) 2x-3=19
b) 5x-2=3x+12
c)2x+1=x-1
------------------
5----------------2 (este o linie la c sub 2x etc .. e linie dedesupt si la 2x+1 este 5 dedesupt iar la x-1 este 2 dedesupt .. sper ca intelegeti ).


2) Aflati x :

a) 2x-1∈D12
b) x+3/2x+15.

Multumesc frumos ! :)


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