[tex]\sqrt{ 7 } +(9 \sqrt{ 14 } ) \div (-3 \sqrt{ 2 } ) = \\ \sqrt{7}+\frac{3\sqrt{14}}{-\sqrt{2}} = \\ \sqrt{7}+\frac{-3\sqrt{14}}{\sqrt{2}} = \\ \sqrt{7}+\frac{-3\sqrt{14}\sqrt{2}}{\left(\sqrt{2}\right)^{2}} = \\ \sqrt{7}+\frac{-3\sqrt{14}\sqrt{2}}{2} = \\ \sqrt{7}+\frac{-3\sqrt{2}\sqrt{7}\sqrt{2}}{2} = \\ \sqrt{7}+\frac{-3\times 2\sqrt{7}}{2} = \\ \sqrt{7}-3\sqrt{7} = \\ -2\sqrt{7} [/tex]
Sper că te-am ajutat!
