Răspuns:
Sper ca ti-am fost de ajutor! Coroana?
Explicație pas cu pas:
[tex]\frac{2\sqrt{7} }{21}+\frac{3\sqrt{7} }{20}=\frac{103\sqrt{7} }{420}[/tex]
[tex]c) (-1-4+3)\sqrt{7}=-2\sqrt{7} \\d)15\sqrt{6}+\sqrt{6}=16\sqrt{6} \\e)(12\sqrt{3}):(3\sqrt{3})-5=4-5=-1\\f)3\sqrt{2}+7\sqrt{2}=10\sqrt{2}\\g)\frac{3}{\sqrt{2} }*\frac{\sqrt{6} }{2}+\frac{5}{2\sqrt{3} }=3*\frac{\sqrt{3} }{2}+\frac{5\sqrt{3} }{6}=\frac{3\sqrt{3} }{2}+\frac{5\sqrt{3} }{6}=\frac{7\sqrt{3} }{3}\\h) \frac{3\sqrt{5} }{2}+\frac{2\sqrt{5} }{15}=\frac{49\sqrt{5} }{30}\\i) \frac{2\sqrt{7} }{21}+\frac{\sqrt{3} }{5}*\frac{\sqrt{21} }{4}=\frac{2\sqrt{7} }{21}+\frac{\sqrt{63} }{20}=[/tex]
=[tex]\frac{2\sqrt{7} }{21}+\frac{3\sqrt{7} }{20} = \frac{103\sqrt{7} }{420}[/tex]
