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1) kn= (6:-2)n => kn=(-3)n.
Với n lẻ => k=-3
Với n chẵn => k=3 và k=-3
2) |x-3|(|x-3|-1)=0
=> |x-3|=0 hoặc |x-3|-1=0
=> |x-3|=0 hoặc |x-3|=1
=> x-3=0 hoặc x-3=1 hoặc x-3=-1
=> x=3 hoặc x=4 hoặc x=2