1, C -> education

2, recruits => recruiters

3, Wooden => woods 

4, c => high

5, b -> spetacular

6, D -> write

a) Ta có: \(A=\dfrac{4\sqrt{6}-2\sqrt{10}}{2\sqrt{2}}+\dfrac{4}{\sqrt{3}-\sqrt{5}}+3\sqrt{6-2\sqrt{5}}\)

\(=\dfrac{2\sqrt{2}\left(2\sqrt{3}-\sqrt{5}\right)}{2\sqrt{2}}-\dfrac{4\left(\sqrt{5}+\sqrt{3}\right)}{2}+3\left(\sqrt{5}-1\right)\)

\(=2\sqrt{3}-2\sqrt{5}-2\sqrt{5}-2\sqrt{3}+3\sqrt{5}-3\)

\(=-\sqrt{5}-3\)

b) Ta có: \(B=3\tan67^0+5\cdot\cos^216^0-3\cdot\cot23^0+5\cdot\cos^274^0-\dfrac{\cot37^0}{\tan53^0}\)

\(=3\tan67^0-3\tan67^0+5\cdot\left(\sin^274^0+\cos^274^0\right)-1\)

\(=5-1=4\)

P6:

1. big

2. been

3. bought

4. people

P7:

1. T

2. F

3. F

4. F

57

25

57

will go

A

a

Đoạn AB: nước nóng lên.

Đoạn BC: nước sôi.

Đoạn CD: nước nguội đi.