đưa câu kahcs đi bạn

ban oi minh biet dap so thoi 

mấy bạn làm ơn ghi kết quả giúp mình với, nếu ko bik cách giải thì mí abnj ghi kết quả cũng đc

1 A

2 D

3 B

4 D

5 A

6 D

7 C

8 A

9 C

10 B

11 D

IV

12 went

13 is playing

14 closing

15 don't drink

16 would visit

17 B

18 D

19 B

20 D

21 cook

22 it

23 his

24 On

25 him

26 because

27 B

28 D

29 C

30 B

31 A

VIII

1 Janet isn't interested in watching sports on TV

2 I Think you should go to school by bike

3 Lake Baikal is the deepest lake in the world

4 He doesn't have enough time to complete the test

5 The last time he visited HLB is 5 years ago

IX 

37 In dry season there is alway a lack of water

38 Yesterday he was so tired that he didn't finish his work

39 There are 10 fingers and two arms on the body

40 What kind of TV programme do you like to watch the most when you were small?

Trong hai số liên tiếp phải có 1 số chẵn và một số lẻ mà số chẵn thì chia hết cho 2. 

tick nha

\(\frac{3n}{n+1}=\frac{3n+3-3}{n+1}=\frac{3n+3}{n+1}-\)\(\frac{3}{n+1}=3-\frac{3}{n+1}\)

Để\(\frac{3n}{n+1}\in N\Rightarrow3-\frac{3}{n+1}\in N\Rightarrow\frac{3}{n+1}\in N;\frac{3}{n+1}\le3\)

\(\Rightarrow n+1=1\)hoặc \(n+1=3\)

TH₁: \(n+1=1\Rightarrow n=0\)Khi đó: \(\frac{3n}{n+1}=\frac{3.0}{0+1}=0\)

TH₂: \(n+1=3\Rightarrow n=2\) Khi đó: \(\frac{3n}{n+1}=\frac{3.2}{2+1}=\frac{6}{3}=2\)

ths bạn nhiều nhea

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