chứng minh rằng nếu tổng của hai số nguyên chia hết cho 3 thì tổng các lập phương chia hết cho 9

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1.Complete the sentence so that it has the same meaning as the sentence(s) before it. 1.I have a close friend. He is a CEO in New York. => I have a close friend who………………………………………………………………………. 2.Remember to say sorry when you have done something wrong. => Don't …………………………………………………………………………………………………… 3.Despite the difficult math question, Vicky solved it in five minutes. => Although the math ……………………………………………………………………………... 4.My friends are so humorous that I can't help laughing at their jokes. => I have such……………………………………………………………………………………... 5.Bill is such a careless driver that he has many traffic accidents. => If Bill drove ………………………………………………………………………………….. 6. Murder is the most serious of all crimes. => No crime is 7.This is the first time I have lived in a city with a high crime rate. => I am not used ……………………………………………………………………………………. 8. I’ve never eaten this food before. => This is ………………………………………………………………………… 9. We couldn’t go out because the weather was so bad. => It was such …………………………………………………………………………………………. 10. She is fond of her nephew although he behaves terribly. (in spite of) ____________________________________________________________ 11. He didn’t hurry, so he missed the bus. (if) ____________________________________________________________ 12. The day was so cold that we stayed indoors. (too) ____________________________________________________________ 13. The old man is my grandfather. He lives next door. (who) => ____________________________________________________________ 14. Hoa wants to be an artist in the future. Hoa wishes………………………………………………………………………………………….. 15. It began raining two hours ago. It has………………………………………………………………………………………………………. Lm hộ mk với