Ta có 2n³-n²+7n-1 : (n²+3)=2n-1 dư n-2
⇒ Để 2n³-n²+7n-1 chia hết (n²+3)
⇒n-2=0
⇒n=2
Vậy n=2 thì 2n³-n²+7n-1 chia hết (n²+3)
A = 2n³ + 7n - 1 - n²
= 2n³ + 6n - n² - 3 + (n + 2)
= 2n( n² + 3 ) - (n² + 3) + (n + 2)
= ( 2n - 1)(n² + 3) + ( n + 2)
Ta có ( 2n - 1)(n² + 3) $\vdots$ (n² + 3)
⇒ Để A $\vdots$ (n² + 3) thì ta phải có n+2 $\vdots$ (n² + 3)
mà n² + 3 ≥ n + 2
⇒ Ta có hai TH
TH1: n + 2 = 0 ⇒ n = -2
TH2 : n²+ 3 = n+ 2 ⇒ n²+ 1 - n = 0
⇒ n ( n - 1 ) = -1 ( vô lí )
Vậy n = -2
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. Điểm cực tiểu của đồ thị hàm số y = x3 – 3x + 1 là:
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EXERCISE 5: 1. He said, “ This is the book you have been looking for”. ............................................................................................................................................... 2. She said, “ You can come with us if you like”. ............................................................................................................................................... 3. The old man said, “ I will take you to my house right now”. ............................................................................................................................................... 4. He was still declaring, “ You are the man who did it”. ............................................................................................................................................... 5. The man said announced, “ The hero is coming”. ............................................................................................................................................... 6. She said, “ I wrote to my sister only last week”. ............................................................................................................................................... 1. The man declared, “ I shall be doing exactly the same work next Monday as I am doing today”. ............................................................................................................................................... 2. The foreigner told him, “ I am French but I have learnt English at school”. ............................................................................................................................................... 3. The boy said, “ I have to go to the dentist tomorrow”. ............................................................................................................................................... 4. We were informed, “ The car is ready, we shall have to get back before the clock strikes four”. ............................................................................................................................................... 5. The librarian said, “ This book was lent to him weeks ago and he has only just returned it”. ............................................................................................................................................... 6. The girl said, “ I was born in 1954 and I have been living in this small town since”. ............................................................................................................................................... 7. They said, “ We have stayed here for a month, we shall go home next week”. ............................................................................................................................................... 8.He repeated day after day, “ This climate does not suit my health, I must go away as soon as can”. ............................................................................................................................................... ...................
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