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A=x,xN'3x<18
Va rog frumos repede


Răspuns :

A={1;3;5;15}
B={-1;1;-2;2;-3;3}
C={1}
18/x+3=>x/15=>x apartine D15                                   
9/3+x=>x/6=> x apartine D6
3x+2/2x+3=>3x-2x/3-2=>x/1=>x apartine D1