Resposta:
a)
[tex] \sqrt{10} \times \sqrt{10} = \sqrt{10 \times 10} = \sqrt{100} = 10[/tex]
[tex]b)3 \sqrt{3x} \times \sqrt{7} = 3 \sqrt{3x \times 7} = 3 \sqrt{21x} [/tex]
[tex]c)8 \sqrt{ 3} \times \sqrt{3} = 8 \sqrt{3 \times 3} = 8 \sqrt{9} = 8 \times 3 = 24[/tex]
[tex]d)9 \sqrt{5} . \sqrt{5} = 9 \sqrt{5 \times 5} = 9 \sqrt{25} = 9 \times 5 = 45[/tex]
