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Aflati numarul rational ×,stiind ca:×÷3=2,1(4)

Răspuns :

x=3*2,1(4)
x=6,4(3)
Sper cca te-am ajutat
2,1(4)=(214-21)/90=193/90
x:3=193/90
x=193/90×1/3
x=193/270