Hướng dẫn trả lời:
`2sqrt{2}.(sqrt{3} - 2) + (1 + 2sqrt{2})^2 - 2sqrt{6}.`
`= 2sqrt{2}.sqrt{3} - 2sqrt{2}.2 + 1^2 + 2.1.2sqrt{2} + (2sqrt{2})^2 - 2sqrt{6}.`
`= 2sqrt{6} - 4sqrt{2} + 1 + 4sqrt{2} + 8 - 2sqrt{6}.`
`= (2sqrt{6} - 2sqrt{6}) + (- 4sqrt{2} + 4sqrt{2}) + (1 + 8).`
`= 9.`
Đáp số:
`= 9.`