Resposta:
Olá bom dia!
a)
[tex]3\sqrt{7} + 10\sqrt{7} = 10\sqrt{7}[/tex]
b)
[tex]2\sqrt{3} - 9\sqrt{3} + \sqrt{36} = -7\sqrt{3} + 6 = 6-7\sqrt{3}[/tex]
c)
[tex]10\sqrt{25} -2\sqrt{2} -4\sqrt{169} + \sqrt{36} \\\\= 10*5 - 2\sqrt{2} -4 *13 + 6\\\\= 50 - 2\sqrt{2} -52 + 6\\\\= 4-2\sqrt{2}[/tex]
