`6b-b^2-10<0`
`⇔b^2-6b+10>0`
`⇔b^2-3b-3b+9+1>0`
`⇔b(b-3)-3(b-3)+1>0`
`⇔(b-3)(b-3)+1>0`
`⇔(b-3)^2+1>0`
Ta có:
`(b-3)^2≥0`
`⇒(b-3)^2+1>0`
`⇒6b-b^2-10<0`
Đáp án:
Giải thích các bước giải:
$6b-b^2-10$
$=6b-b^2-9-1$
$=-(b^2-6b+9)-1$
$=-(b-3)^2-1$
$(b-3)\geq0∀x⇒-(b-3)\leq0∀x$
$⇒-(b-3)-1<0∀x$
Hay :$6b-b^2-10<0∀x$
Chúc em học tốt.
8 hộp có 96 cái kẹo . Vậy 5 hộp kẹo có mấy cái
Exercise 2: Using the given information, make conditional sentences with IF 1. He didn't hurry, so he missed the train. → If ................................................................................................................... 2. We didn't go because it rained. → If it hadn't .................................................................................................... 3. We got lost because we didn't have a map. → If we ............................................................................................................. 4. He lost his job because he was late every day. → If he .............................................................................................................. 5. The airport was closed. She didn't fly to Rome. → If ................................................................................................................... 6. Sue felt sick because she ate four cream cakes. → If Sue ............................................................................................................ 7. My brother didn't leave the car keys, so I couldn't pick him up at the station. → If my brother ................................................................................................ 8. We didn't go on holiday because we didn't have enough money. → If we ............................................................................................................. 9. He didn't have the ticket to the game last week. He wasn't be able to get in. → If ................................................................................................................... 10. Robert got a bad cough because he started smoking cigarettes. → If Robert .......................................................................................................
16. If you had told me that he never paid his debts, I (not lend) _____him the money. 17. If you (not sneeze) _____,he wouldn't have known that we were there. 18. If you (put) _____some mustard in the sandwiches, they would have tasted better. 19. The hens (not get) _____ into the house if you had shut the door. 20. If he had known that the river was dangerous, he (not try) _____to swim across it. 21. If you (speak) _____ more slowly, he might have understood you. 22. If he had known the whole story, he (not be) _____ so angry. 23. I shouldn't have eaten it if I (know) _____that there was ginger in it. 24. If I (try) _____ again, I think that I would have succeeded. 25. You (not get) _____ into trouble if you had obeyed my instructions. 26. If you hadn't been in such a hurry, you (not put) _____sugar into the sauce instead of salt. 27. If I (be) _____ready when he called, he would have taken me with him. 28. She had a headache; otherwise she (come) .................with us. 29. If she had listened to my directions, she (not turn)............... down the wrong street. 30. If you (look) _____ at the engine for a moment, you would have seen what was missing.
`1 : Tìm x, y` `x/3 = y/6 = 16/12`
tìm điều kiện xđ của 1/(căn x)-1
Exercise 1: Put the verbs in the brackets in the correct tense 1. If I had known that you were in hospital, I (visit) _____ you. 2.You would have seen my garden at its best if you (be) _____ here last week. 3. I shouldn't have believed it if I (not see) _____ it with my own eyes. 4. If he had asked you, you _____(accept) ? 5. If I (know) _____that you were coming, I'd have baked a cake. 6. If I (had) _____a map, I would have been all right. 7. The hens (not get) _____. into the house if you had shut the door. 8. If he had known that the river was dangerous, he (not try) _____ to swim across it. 9. If you (speak)_____more slowly, he might have understood you. 10. If he had known the whole story , he (not be) _____so angry. 11. I (offer) _____ to help him if I had realized that he was ill. 12. If you had left that wasp alone, it (not sting) _____you. 13. If I (realize) _____what a bad driver you were, I wouldn't have come with you. 14. If I had realized that the traffic lights were red, I (stop) _____ 15. But for the fog, we (reach) _____ our destination ages ago.
2/3 -1/4 +5/11 _______________ 5/12 +1 -7/11 tính bằng cách thuận tiện ai làm được thì nhanh lên mik sắp nộp rồi
viết 1 bài văn nghị luận về tình bạn(không chép mạng)
Các bạn chuyên giải toán và ôn toán giúp mình giải toán với ( giải hay và đúng yêu cầu của mình sẽ cho câu trả lời hay nhất nha)
VẼ HÌNH NHA a) Vẽ tam giác ABC vuông tại A có một góc nhọn nằng 45 0 .Dùng thước đo góc xác định độ lớn góc còn lại . . Dùng thước thẳng đo độ dài 3 cạnh của tam giác và tìm mối liên hệ giữa 3 cạnh ấy b)Vẽ tam giác ABC vuông tại B có một góc nhọn nằng 30 0 .Dùng thước đo góc xác định độ lớn góc còn lại ? Dùng thước thẳng đo độ dài 3 cạnh của tam giác và tìm mối liên hệ giữa 3 cạnh ấy c)Vẽ tam giác ABC có hai góc nhọn nằng 60 0 .Dùng thước đo góc xác định độ lớn góc còn lại . . Dùng thước thẳng đo độ dài 3 cạnh của tam giác và tìm mối liên hệ giữa 3 cạnh ấy
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến
