1.A

2.C

3.A

4.B

5.C

6.C

7.B

8.C

We have less money than you.

Quang has been offered the opportunity to study abroad.

It is not necessary for school uniform to be worn at all times.

D

Goes

Giải:

Ta có: ∠O₁ + ∠O₂ = 180⁰ (2 góc kề bù)

Mà ∠O₂ − ∠O₁ =30⁰

⇒ ∠O₂ = 180⁰ + 30⁰ = 210⁰

⇒ ∠O₂ = 210⁰:2 = 105⁰ ⇒ ∠O₂ =∠O₄ = 105⁰ (đối đỉnh) 

⇒ ∠O₁ = 180⁰ −105⁰ = 75⁰ ⇒ ∠O₁ = ∠O₃ = 75⁰ (đối đỉnh)