Am nevoie de instructiuni pas cu pas. Multumesc in avans

√0,3×2,1(3)
Transformam in fractii ordinare :
0,3 = 3/ 10
2,1(3) = 2 13-1/90 = 2 12/90 = 2×90+12/90 = 192/90
√3/10 × 192/90 = √192/300 = √ 6√3/10√3 = √6/10 = √3/5=√15/5(am rationalizat)