Ta có:

C = 137.454 + 206 = 137.(453+1) + 206

                               = 137.453 + 137 + 206

                               = 137.453 + 343

D = 453.138 - 110 = 453.(137+1) - 110

                              = 137.453 + 453 - 110

                              = 137.453 + 343

Ta thấy: C = D = 137.453 + 343 \(\Rightarrow\) C = D.

His sister lives in Flat 8 on fourth floor of Thien An Tower.

radios - an

1. Is your brother having lunch?

No, he isn't. He is sleeping.

2. Mary is singing an English song in the classroom.

3. The dog is playing with its children.

B. to be divided

What time do you (go) go to school everyday?

1. Do teenagers read fashion magazines?

→ Are fashion magazines read by teenagers?

2. Does fashion influence young teenagers?

→ Are young teenagers influenced by fashion?