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21a×a=1290 repede va rog

Răspuns :

21 a^2 = 1290 I :3
7a^2 = 430
a= +/-rad(430/7) ≈ +/- rad 61,428571 ≈ +/- 7,8376381 ≈ +/- 7,84(rotunjit prin adaos la sutimi)