Question

Tinh:\(\left(\sqrt{10}+1\right).\left(\sqrt{10}-1\right)\)

Answer 1

\(\left(\sqrt{10}+1\right)\left(\sqrt{10}-1\right)=\left(\sqrt{10}\right)^2-1=10-1=9\)

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Answer 2

\(\sqrt{\sqrt{10}-1}.\sqrt{\sqrt{10}+1}=\sqrt{\left(\sqrt{10}-1\right)\left(\sqrt{10}+1\right)}=\sqrt{\left(\sqrt{10}\right)^2-1}=\sqrt{10-1}=\sqrt{9}=3\)

Phải vậy không

Answer 3

 = 9 

  tick đúng cho mình nhá !