1.D

2.A

3.D

chức bạn học giỏi

cả 3 cái đều là hợp số chỉ có số 73 là số nguyên tố vì 1431 chia hết cho 1  ,  3 , 9,chính nó,.....

635 chia hết cho 1 ,5 chính nó,....

119 chia hết cho 1 , 7 chính nó,...

73 chia hết cho 1 và chính nó

cậu viết sai đầu bài rồi thế mà có hàng nghìn số thập phân

1. This well- known library attracts many people.

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2. We don't often help her with the housework .

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3. Do they grow rice and wheat in the North of England?

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1. He is preparing everything for the presidential election.

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2. Is she translating an article from English into Vietnamese?

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3. The Prime Minister isn't making a speech at the moment.

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4.They are doing a physical experiment in the laboratory.

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5. Are they digging a pond in the garden?

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1. A group of students have met their friend at the railway station

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2. No one has ever known him to be dishonest

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3. Mr.Smith has taught us French for 2 years

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4. They have moved nothing in your room since they sent you to hospital.

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5. Have you typed all the letters ?

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1. They didn’t allow Tom to take these books home

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2. When did they found this organization?

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3. They didn't look after the children properly

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4. Nobody swept this street last week

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