Question

\(\left(1+\sqrt{2}-\sqrt{3}\right).\left(1+\sqrt{2}+\sqrt{3}\right)\)

Answer 1

Làm lại : \(\left(1+\sqrt{2}-\sqrt{3}\right)\left(1+\sqrt{2}+\sqrt{3}\right)=\left(1+\sqrt{2}\right)^2-3=3+2\sqrt{2}-3=2\sqrt{2}\)

Answer 2

\(\left(1+\sqrt{2}-\sqrt{3}\right)\left(1+\sqrt{2}+\sqrt{3}\right)=\left(1+\sqrt{2}\right)^2-\sqrt{3}^2=1+2-3=0\)

Answer 3

(1+√2−√3)(1+√2+√3)=(1+√2)^2−3=3+2√2−3=2√2

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