Question

7 8 ạ

Answer 1

Câu 8:

a: \(=2-\sqrt{3}\)

b: \(=\sqrt{11}-3\)

c: =2|a|=2a

d: \(=3\left|a-2\right|=3\left(2-a\right)=6-3a\)

Answer 2

Bài 7:

`a) sqrt{(0,1)^2} = |0,1| =0,1`

`b) sqrt{(-0,3)^2} = |-0,3| = 0,3`

`c) -sqrt (-1,3)^2 = -|-1,3| = -1,3`

`d) -0,4 sqrt{(-0,4)^2} = -0,4*|-0,4| = -0,4*0,4 = -0,16`

Bài 8

\(\sqrt{\left(2-\sqrt{3}\right)^2}=\left|2-\sqrt{3}\right|=2-\sqrt{3}\left(2>\sqrt{3}\right)\)

\(\sqrt{\left(3-\sqrt{11}\right)^2}=\left|3-\sqrt{11}\right|=\sqrt{11}-3\left(\sqrt{11}>3\right)\)

`2sqrt{a^2} = 2|a|=2a (a>=0)`

`3sqrt{(a-2)^2} = 3|a-2| = 3(2-a) = 6-3a (a<2)`