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rom03012002
2 năm trước
CM rằng pt x^6 -7x^4 + 5x^3 -8x +1 có ít nhất 3 nghiệm trên khoảng (-1 ;3)
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VII.Rewrite each sentence, beginning as shown, so that the meaning stays the same. 1. If she had said sorry, he wouldn’t have been angry. 2. If they had passed the exam, their family wouldn’t have been very sad. 3. f it hadn’t rained last night, I would have gone to the barbecue. 4. If the weather had been very nice, we would have gone camping. 5. If Peter had come, we wouldn’t have cancelled the meeting. 6. If I had had time, I would have visited them. 7. If I hadn’t lost my wallet, I would have bought that coat. 8. If the waves hadn’t been so strong, we would have swum 9. If the fire brigade hadn’t come immediately, the house would have burnt down 10. If the men hadn’t been wearing protective clothing, they wouldn’t have been all quite safe. 11. If Tom had come, we wouldn’t have cancelled the meeting 12. If I had known how difficult it was. I wouldn’t have taken the job

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