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18 tháng 9 2021

33 Bao is young enough to drive a car

34 In the past my hair used to be shorter than it is now

35 I will give you a call tomorrow morning

36 I think you should tell her about your problem

18 tháng 9 2021

33. Bao is not old enough to drive a car

34. In the past my hair used to be shorter than now

35. I'll give you a call tomorrow morning

36. I think you should tell her about your problem

22 tháng 5 2021

II

1 B

2 A

3 D

III

1 B

2 C

3 B

4 B

IV

1 B

13 A

14 C

15 D

17 B

18 B

19 D

20 B

21 tháng 10 2019

Câu hỏi của Solyver - Toán lớp 7 - Học toán với OnlineMath

NV
9 tháng 3 2022

\(\lim\dfrac{3^n+2.6^n}{6^{n-1}+5.4^n}=\lim\dfrac{6^n\left[\left(\dfrac{3}{6}\right)^n+2\right]}{6^n\left[\dfrac{1}{6}+5\left(\dfrac{4}{6}\right)^n\right]}=\lim\dfrac{\left(\dfrac{3}{6}\right)^n+2}{\dfrac{1}{6}+5\left(\dfrac{4}{6}\right)^n}=\dfrac{0+2}{\dfrac{1}{6}+0}=12\)

\(\lim\left(\sqrt{n^2+9}-n\right)=\lim\dfrac{\left(\sqrt{n^2+9}-n\right)\left(\sqrt{n^2+9}+n\right)}{\sqrt{n^2+9}+n}=\lim\dfrac{9}{\sqrt{n^2+9}+n}\)

\(=\lim\dfrac{n\left(\dfrac{9}{n}\right)}{n\left(\sqrt{1+\dfrac{9}{n^2}}+1\right)}=\lim\dfrac{\dfrac{9}{n}}{\sqrt{1+\dfrac{9}{n^2}}+1}=\dfrac{0}{1+1}=0\)

\(\lim\dfrac{\sqrt{15+9n^2}-3}{5-n}=\lim\dfrac{n\sqrt{\dfrac{15}{n^2}+9}-3}{5-n}=\lim\dfrac{n\left(\sqrt{\dfrac{15}{n^2}+9}-\dfrac{3}{n}\right)}{n\left(\dfrac{5}{n}-1\right)}\)

\(=\lim\dfrac{\sqrt{\dfrac{15}{n^2}+9}-\dfrac{3}{n}}{\dfrac{5}{n}-1}=\dfrac{\sqrt{9}-0}{0-1}=-3\)

11 tháng 3 2022

em cảm ơn ạ

14 tháng 6 2021

reach => to reach nhé

21 tháng 12 2021

3.Have you finished your homework yet?

5.I have never donated blood before

tớ biết mỗi 2 câu này thôi

28 tháng 12 2021

was thought that the house was broken into last night. 

house was thought to have been broken into last night. 

hotel regulations should be read carefully by the hotel guests. 

languages are spoken in Canada? 

bike was left in the hall this morning.