x = 60 độ

C

A

C

D

1. Yes, I am

2. The teacher teaches me very well

3. Math has helped me train my thinking and taught me to try not to give up

4. No, just be patient and you will succeed

5. Because learning math will help us gain more interesting knowledge and bring success in all fields

a, ta có : H1=H2 = 120 (đối đỉnh )

b, ta có : m // n 

               \(H_2\)và \(G_1\)LÀ 2 góc trong cùng phía 

                    \(\Rightarrow\)\(H_2\)+ \(G_1\)= \(180^0\)(trong cùng phía)

                                 \(G_1\)= \(180^0\)- \(H_2\)= \(180^0\) - \(120^0\)= \(60^0\)

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