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8 nha bạn

Ta có: abc = 100.a + 10.b +c = n^2 - 1 (1)
cba = 100.c + 10.b + a = n^2- 4n + 4 (2) 
Lấy (1) trừ (2) ta được:
99.(a – c) = 4n – 5
Suy ra 4n - 5 chia hết 99 
Vì 100 $\le$≤  abc $\le$≤ 999 nên:
100 $\le$≤ n^2 -1 $\le$≤ 999 => 101 $\le$≤ n^2 $\le$≤ 1000 => 11 $\le$≤ 31 => 39 $\le$≤ 4n - 5 $\le$

Fill in the correct form of the words in brackets (comparative or superlative)

1. Janet is (beautiful)......... Jennifer.

2. You are (crazy).......my sister.

3. We can run (fast)....they can.

4. My mom is not (strict)......your mum.

5. Your mobile phone is not (trendy) ............. mine.

6. Matrix II was not (interesting)...........Matrix I.

Fill in the correct form of the words in brackets (comparative or superlative)

1. My suitcase is ......................(large) than your suitcase.

2. This scarf is...................(beautiful) than the one in the window.

3. The palace Hotel was ........................(expensive) than the Grosvenor.

4. John is a ...................(good) gardener than Stuart.

5. They are not going to the ....................( bad) hotel.

6. The palace is the .......................(expensive) hotel.

7. John is the................................ (good) gardener.

8. These are the .....................(beautiful) colours.

9. Mr.Smith is....................... (bad) today than yesterday.

HELP ME!!!!!!!!!!!!!!!!!!!!!!

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