Question

giải hộ mình đi ạ

Answer 1

`a, (sqrt 2 + 1)(1 - sqrt 2)`

`= 1 - 2 = -1`

`b, (sqrt 3 + 1)(1 - sqrt 3)`

`= 1 - 3 = -2`

`c, (sqrt 3 + sqrt 2)(sqrt 3 - sqrt 2)`

`= 3 - 2 = 1`

`d, (sqrt 3 + sqrt 2)(sqrt 2 - sqrt 3)`

`= 2 - 3 = -1`

`e, (sqrt 3 + sqrt 5)(sqrt 3 - sqrt 5)`

`= 3 - 5 = -2`

`f, (sqrt 2 + sqrt 5)(sqrt 5 - sqrt 2)`

`= 5 - 2 = 3`

`g, (sqrt 3 - 3)(sqrt 3 + 3)`

`= 3 - 9 = -6`

`h, (3 + sqrt 5)(sqrt 5 - 3)`

`= 5 - 9 =-4`

Áp dụng hằng đẳng thức: `(a-b)(a+b) = a^2 - b^2`

Answer 2

3. 1-2=-1

4.1-3=-2

5.3-2=1

6.2-3=-2

7.3-5=-2

8.5-2=3

9.3-9=-6

10. 5-9=-4