could bought

16b
17c
18b
19b
20a
21b
23c

24d

mk chịu

a)
có CD vuông góc với CE
     EF vuông góc với CE
=>     CD//EF

1b
2c
3d
8b
9a

I
1d
2b
3b
4b

 

\(\dfrac{\sqrt{x^2-4}}{\sqrt{x-2}}=3\)
\(\dfrac{\sqrt{\left(x-2\right)^2}}{\sqrt{x-2}}=3\)
\(\dfrac{\sqrt{x-2}.\sqrt{x-2}}{\sqrt{x-2}}=3\)
\(\sqrt{x-2}=3\)
\(\left(\sqrt{x-2}\right)^2=3^2\)
\(x-2=9\)
x =  11

1, have you bought your motobike
2, The traffic laws must be respected 
3,A cooking club has been created by the town council
4. Living in a village always seems strange to me.
I have never lived in a village before 
7. If you don't leave home now, you will miss the flight.
8. I asked my mother if she write a note for Anna 
9. When the manager arrived the office , Sue had left there 
 

có rồi mà

A = 3².4³- 3²+33
A = 3²(4³-1) + 33
A = 9(64-1) + 33
A = 9.63 + 33
A= 567+33
A = 600