Question

dau funda si inimaaaaaaaaaaaaaaaa

Answer 1

Nu prea se intelege, asa ca o sa imi dau toata silinta. (N-ai prins nici cerinta in poza, iar calitatea lasa de dorit)

$-\frac{3}{4} \sqrt{7} =-\sqrt{(\frac{3}{4})^{2} *7} =-\sqrt{\frac{9*7}{16} } =-\sqrt{\frac{63}{16} } \\-\frac{4}{9} \sqrt{5} =-\sqrt{(\frac{4}{9})^{2} *5} =-\sqrt{\frac{16*5}{81} } =-\sqrt{\frac{80}{81} } \\\\-\frac{2}{3} \sqrt{7} =-\sqrt{(\frac{2}{3})^{2} *7} =-\sqrt{\frac{4*7}{9} } =-\sqrt{\frac{28}{9} }$

NICIODATA sa NU bagi "-" sub radical, nu se scoate radical niciodata dintr-un numar negativ(decat daca puterea radicalului este impara)