Gọi $d: y=kx+b$
Thay $x=-1; y=5$ ta có:
$-k+b=5$
$\to b=k+5$
$\to d: y=kx+k+5$
Phương trình hoành độ giao:
$-x^3+3x^2+1=kx+k+5$
$\to x^3-3x^2+kx+k+4=0$
$\to (x+1)(x^2-4x+k+4)=0$
Để có ba giao điểm phân biệt: $x^2-4x+k+4=0$ có hai nghiệm PB khác $-1$
$\to \begin{cases} 1+4+k+4\ne 0 \\ \Delta'=4-k-4>0\end{cases}$
$\to \begin{cases} k\ne -9\\ k<0\end{cases}$
Vậy $k\in (-\infty;-9)\cup(-9;0)$
Đáp án:
Như hình
Giải thích các bước giải:
Có gì k hiểu thì nói
lượng sinh tố trong quá trình lấu nướng của các sinh tố sau là bao nhiêu phầm châm sinh tố c sinh tố B1 sinh tố B2 sinh tố PP Caroten
Tính theo quy tắc: 0 : [(1800 + 60) : 30]
bắt buộc phải có cấu trúc đi kèm+làm đúng nếu ko=report viết lại câu 66. I applied for the job but was turned down. →My 67. There are more people out of work in this country than ever before. →Never 68. Let’s clean the dishes in the morning. (WASHING) →Let’s 69. “Please don’t drive so fast!” Ann begged her friend. →Ann pleaded. 70. I’m sure he took your briefcase by mistake. →I am sure he 71. He’ll settle down. Then his performance will improve. →Once 72. The result of the match was never in doubt. →At no time 73. This will be the orchestra’s first performance outside London. →This will 74. The fridge is completely empty. (LEFT) →There is 75. Can you tell me where the Midland Hotel is? (DIRECT) →Can 76. The accident wasn’t his fault. (BLAME) →He 77. Although he seems friendly, he’s not to be trusted. →Friendly 78. Not until the body was found did the police believe her. →It was 79. Everyone but Jane failed to produce the correct answer. (SUCCEEDED) →Only Jane 80. I was scared to tell him what I really thought. (COURAGE) →I didn’t
giải giúp e hết trang đó ạ ai biết bài nào làm trước cũng được ạ
They don't open the bank during the weekend
Ai làm nhanh vs đúng mình cho 5 sao vs 50đ
Làm từ bài 20 đến 30 hoặc nhiều hơn cũng đc nha
Giúp mk với các bạn,ai xong tr cho 5 sao
bắt buộc phải có cấu trúc đi kèm+làm đúng nếu ko=report viết lại câu 56. Betty is very happy to look after handicapped people. →Betty is 57. The decorators have finished the whole of the first floor. →We have 58. If you want my advice, I would forget about buying a new house. →If I 59. The only way to eliminate world terrorism is by united opposition. →Only by 60. We have run out of small sizes. (STOCK) → 61. I’m sure you were driving too fast. →You 62. It was overeating that caused his heart attack. →If 63. The storm completely wiped out all my crops. →I have 64. He suddenly thought that he might have misunderstood her. →It crossed 65. His second attempt on the world record was successful. → He broke
Hộ mình bài này với ạ. Mình cảm ơn
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