Obliczenia
[tex]\sqrt{12}-\sqrt{147}+2\sqrt{108}=\\\\=\sqrt{4\cdot3}-\sqrt{49\cdot3}+2\sqrt{36\cdot3}=\\\\=\sqrt{2^2\cdot3}-\sqrt{7^2\cdot3}+2\cdot\sqrt{6^2\cdot3}=\\\\=2\sqrt3-7\sqrt3+12\sqrt3=-5\sqrt3+12\sqrt3=7\sqrt3\\\\\huge\boxed{\text{Odp}. \ \text{A}}[/tex]
