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Le Lan Anh
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Tôi học giỏi toán
7 tháng 8 2018 lúc 11:34

khongcamxuc_123 đó nha bn bn phải giữ lời hứa đấy nha 

~~~~ hok tốt ~~~~!!!!

Nguyễn Tuyết Mai
7 tháng 8 2018 lúc 11:38

k ngày 3 lần được ko đó hứa nha !

Phạm Quỳnh Nga
7 tháng 8 2018 lúc 14:25

https://olm.vn/thanhvien/khongcamxuc_123 

k Mình nha 

tú khánh
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Lê Hà Dương
19 tháng 2 2022 lúc 11:18

=2001

Khách vãng lai đã xóa
Selena Flynn
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Nguyễn Lê Phước Thịnh
24 tháng 2 2022 lúc 23:27

1:

#include <bits/stdc++.h>

using namespace std;

long long t,i,n;

int main()

{

cin>>n;

t=0;

for (i=1; i<=n; i++) t+=i;

cout<<t;

return 0;

}

Bài 2: 

#include <bits/stdc++.h>

using namespace std;

long long n,i,t;

int main()

{

cin>>n;

t=0;

for (i=1; i<=n; i++)

if (i%2==0) t+=i;

cout<<t;

return 0;

}

 

Nguyễn Lê Phước Thịnh
25 tháng 2 2022 lúc 6:47

Bài 3: 

#include <bits/stdc++.h>

using namespace std;

long long n,i,t;

int main()

{

cin>>n;

t=0;

for (i=1; i<=n; i++)

if (i%2!=0) t+=i;

cout<<t;

return 0;

}

Bài 4: 

#include <bits/stdc++.h>

using namespace std;

long long n,i,t;

int main()

{

cin>>n;

t=0;

for (i=1; i<=n; i++)

if (i%3==0) t+=i;

cout<<t;

return 0;

}

Bài 5: 

#include <bits/stdc++.h>

using namespace std;

long long n,i,t;

int main()

{

cin>>n;

t=1;

for (i=1; i<=n; i++)

t*=i;

cout<<t;

return 0;

}

Lê Phương Anh
Xem chi tiết
Đỗ Thanh Hải
3 tháng 8 2021 lúc 13:35

10. ……………. festival do you choose? - I choose Elephant Race Festival.

A. What B. How C. Which D. When

11. ……………. often is Burning Festival held? - It's held every year.

A. Which B. When C. What D. How

12. ……………. does the teacher say La Tomatina sounds unusual? - Because people throw tomatoes at each other for one hour at the festival.

A. What B. When C. Why D. How

13. He ___________ books for poor children for years.

A. has collected B. collects C. is collecting D. collected

14. Next Saturday at this time, we _____ on the beach in Mexico.

A. will relax B. will be relaxing C. has relaxed D. relax

15. Anne and Joe _____ by sea tomorrow

A. travel B. will travel C. travels D. travelled

16. I_____ in Jakarta, but now I live in New York. [use to + V-inf]

A. used to living B. used to living C. used to live D. am used to live

17. Jane_____ for the telephone company, but now she has a job at the post office.

A. used to working B. used to worked C. is used to work D. used to work

18. …………. he spent much money on the film, it wasn't a big success.

A. Even B. But C. Although D. Despite

19. We didn't find it funny………..it was a comedy.

A. in spite of B. despite C. although D. but

20. I went to the cinema with my friends yesterday ………… feeling very tired.

A. although B. in spite C. despite D. but

21. Let's go to the Victor Cinema. I'm sure you'll find the film…………

A. excites B. excite C. excited D. exciting

22. I was ……… to learn that the director of that gripping film has won the first prize.

A. interest B. interests C. interested D. interesting

23. The film was boring, ____ we went home.

A. so B. when C. but D. if

24. Nam was absent from class yesterday ____ he felt sick.

A. so B. because C. although D. but

25. These books aren’t yours, ____________?

A.are these B. aren’t these C. are they D. aren’t they

26. No one died in the accident, ______________?

A.did they B. didn’t they C. did he D. didn’t he

27. Tom knows Alice, _____________?

A.doesn’t he B. is he C. does he D. isn’t he

28. Peter never comes to class late, ________________?

A. doesn’t he B. doesn’t Peter C. does he D. does Peter

29. ……… computer is a laptop, but ……… is a desktop.

A. Hers - you B. Her - your C. My - yours D. Mine - yours

30. We gave them ……… ID number, and they gave us ……….

A. ours - theirs B. our - theirs C. our -their D. ours - their

Khinh Yên
3 tháng 8 2021 lúc 13:35

Mn giúp mik ak câu nào mn bt thì lm còn lm hết đc thì càng tốt nhé TKS

10. ……………. festival do you choose? - I choose Elephant Race Festival.

A. What B. How C. Which D. When

11. ……………. often is Burning Festival held? - It's held every year.

A. Which B. When C. What D. How

12. ……………. does the teacher say La Tomatina sounds unusual? - Because people throw tomatoes at each other for one hour at the festival.

A. What B. When C. Why D. How

13. He ___________ books for poor children for years.

A. has collected B. collects C. is collecting D. collected

14. Next Saturday at this time, we _____ on the beach in Mexico.

A. will relax B. will be relaxing C. has relaxed D. relax

15. Anne and Joe _____ by sea tomorrow

A. travel B. will travel C. travels D. travelled

16. I_____ in Jakarta, but now I live in New York. [use to + V-inf]

A. used to living B. used to living C. used to live D. am used to live

17. Jane_____ for the telephone company, but now she has a job at the post office.

A. used to working B. used to worked C. is used to work D. used to work

18. …………. he spent much money on the film, it wasn't a big success.

A. Even B. But C. Although D. Despite

19. We didn't find it funny………..it was a comedy.

A. in spite of B. despite C. although D. but

20. I went to the cinema with my friends yesterday ………… feeling very tired.

A. although B. in spite C. despite D. but

21. Let's go to the Victor Cinema. I'm sure you'll find the film…………

A. excites B. excite C. excited D. exciting

22. I was ……… to learn that the director of that gripping film has won the first prize.

A. interest B. interests C. interested D. interesting

23. The film was boring, ____ we went home.

A. so B. when C. but D. if

24. Nam was absent from class yesterday ____ he felt sick.

A. so B. because C. although D. but

25. These books aren’t yours, ____________?

A.are these B. aren’t these C. are they D. aren’t they

26. No one died in the accident, ______________?

A.did they B. didn’t they C. did he D. didn’t he

27. Tom knows Alice, _____________?

A.doesn’t he B. is he C. does he D. isn’t he

28. Peter never comes to class late, ________________?

A. doesn’t he B. doesn’t Peter C. does he D. does Peter

29. ……… computer is a laptop, but ……… is a desktop.

A. Hers - you B. Her - your C. My - yours D. Mine - yours

30. We gave them ……… ID number, and they gave us ……….

 

A. ours - theirs B. our - theirs C. our -their D. ours - their

 

_Banhdayyy_
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An Thy
5 tháng 7 2021 lúc 9:25

i) \(\sqrt{3+2\sqrt{2}}+\sqrt{\left(\sqrt{2}-2\right)^2}=\sqrt{\left(\sqrt{2}\right)^2+2.\sqrt{2}.1+1^2}+\left|\sqrt{2}-2\right|\)

\(=\sqrt{\left(\sqrt{2}+1\right)^2}+2-\sqrt{2}=\left|\sqrt{2}+1\right|+2-\sqrt{2}=\sqrt{2}+1+2-\sqrt{2}=3\)

k) \(\sqrt{4-\sqrt{15}}-\sqrt{4+\sqrt{15}}+\sqrt{6}=\sqrt{\dfrac{8-2\sqrt{15}}{2}}-\sqrt{\dfrac{8+2\sqrt{15}}{2}}+\sqrt{6}\)

\(=\sqrt{\dfrac{\left(\sqrt{5}\right)^2-2.\sqrt{5}.\sqrt{3}+\left(\sqrt{3}\right)^2}{2}}-\sqrt{\dfrac{\left(\sqrt{5}\right)^2+2.\sqrt{5}.\sqrt{3}+\left(\sqrt{3}\right)^2}{2}}+\sqrt{6}\)

\(=\sqrt{\dfrac{\left(\sqrt{5}-\sqrt{3}\right)^2}{2}}-\sqrt{\dfrac{\left(\sqrt{5}+\sqrt{3}\right)^2}{2}}+\sqrt{6}\)

\(=\dfrac{\left|\sqrt{5}-\sqrt{3}\right|}{\sqrt{2}}-\dfrac{\left|\sqrt{5}+\sqrt{3}\right|}{\sqrt{2}}+\sqrt{6}\)

\(=\dfrac{\sqrt{5}-\sqrt{3}}{\sqrt{2}}-\dfrac{\sqrt{5}+\sqrt{3}}{\sqrt{2}}+\sqrt{6}=\dfrac{-2\sqrt{3}}{\sqrt{2}}+\sqrt{6}=-\sqrt{6}+\sqrt{6}=0\)

m) \(2\sqrt{56}-14\sqrt{\dfrac{2}{7}}+\left(\sqrt{7}-\sqrt{2}\right)\sqrt{7}-\dfrac{8\sqrt{2}}{\sqrt{3}-\sqrt{7}}\)

\(=2\sqrt{4.14}-2\sqrt{49.\dfrac{2}{7}}+7-\sqrt{14}+\dfrac{8\sqrt{2}.\left(\sqrt{7}+\sqrt{3}\right)}{\left(\sqrt{7}-\sqrt{3}\right)\left(\sqrt{7}+\sqrt{3}\right)}\)

\(=4\sqrt{14}-2\sqrt{14}+7-\sqrt{14}+\dfrac{8.\left(\sqrt{14}+\sqrt{6}\right)}{4}\)

\(=\sqrt{14}+7+2\left(\sqrt{14}+\sqrt{6}\right)=7+3\sqrt{14}+2\sqrt{6}\)

Akai Haruma
5 tháng 7 2021 lúc 9:45

Lời giải:
i.

\(=\sqrt{(\sqrt{2}+1)^2}+|\sqrt{2}-2|=|\sqrt{2}+1|+|\sqrt{2}-2|=\sqrt{2}+1+2-\sqrt{2}=3\)

k.

\(=\frac{1}{\sqrt{2}}(\sqrt{8-2\sqrt{15}}-\sqrt{8+2\sqrt{15}}+\sqrt{12})\)

\(=\frac{1}{\sqrt{2}}(\sqrt{(\sqrt{3}-\sqrt{5})^2}-\sqrt{(\sqrt{3}+\sqrt{5})^2}+2\sqrt{3})\)

\(=\frac{1}{\sqrt{2}}(|\sqrt{3}-\sqrt{5}|-|\sqrt{3}+\sqrt{5}|+2\sqrt{3})=\frac{1}{\sqrt{2}}(-2\sqrt{3}+2\sqrt{3})=0\)

m.

\(=4\sqrt{14}-2\sqrt{14}+7-\sqrt{14}-\frac{8\sqrt{2}(\sqrt{3}+\sqrt{7})}{(\sqrt{3}-\sqrt{7})(\sqrt{3}+\sqrt{7})}\)

\(=\sqrt{14}+7-\frac{8(\sqrt{14}+\sqrt{6})}{-4}=\sqrt{14}+\sqrt{7}+2(\sqrt{14}+\sqrt{6})=3\sqrt{14}+\sqrt{7}+2\sqrt{6}\)

 

Lê Phương Anh
Xem chi tiết
Út Thảo
2 tháng 8 2021 lúc 8:47

1A 2B 3A 4D 5D 6D 7C 8A 9D 10A 11B 12 C 13B

Mik lm r mak bn .

Lê Phương Anh
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Nguyễn Giang
2 tháng 8 2021 lúc 21:33

Câu 21:B        Câu 22:C        Câu 23:B        Câu 25:B     

Câu 26:A        Câu 28:C        Câu 30:C        Câu 31:Câu hỏi là gì vậy bạn?

 

 

 

 

 

 

Bảo Nguyên
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ngô lê vũ
22 tháng 11 2021 lúc 15:38

(-35) + 23 – (-35) - 47

=(-35+35)+(23-47)

=0+(-24)

=-24

Nguyễn Thanh Tâm
24 tháng 11 2021 lúc 10:35

Đáp án : -24

Lê Phương Anh
Xem chi tiết
ILoveMath
28 tháng 8 2021 lúc 21:26

1) \(\left(2x+3\right)^2=4x^2+12x+9\)

\(\left(3x+2\right)^2=9x^2+12x+4\)

\(\left(2x+5\right)^2=4x^2+20x+25\)

\(\left(2x+\dfrac{1}{3}\right)^2=4x^2+\dfrac{4}{3}x+\dfrac{1}{9}\)

\(\left(3x+\dfrac{1}{3}\right)^2=9x^2+2x+\dfrac{1}{9}\)

2)  \(\left(2x-3\right)^2=4x^2-12x+9\)

\(\left(3x-2\right)^2=9x^2-12x+4\)

\(\left(2x-5\right)^2=4x^2-20x+25\)

\(\left(2x-\dfrac{1}{3}\right)^2=4x^2-\dfrac{4}{3}x+\dfrac{1}{9}\)

\(\left(3x-\dfrac{1}{3}\right)^2=9x^2-2x+\dfrac{1}{9}\)

3) \(\left(2x-3\right)\left(2x+3\right)=4x^2-9\)

\(\left(3x-4\right)\left(3x+4\right)=9x^2-16\)

\(\left(2x-5\right)\left(2x+5\right)=4x^2-25\)

\(\left(x-\dfrac{1}{2}\right)\left(x+\dfrac{1}{2}\right)=x^2-\dfrac{1}{4}\)

\(\left(2x-\dfrac{1}{3}\right)\left(2x+\dfrac{1}{3}\right)=4x^2-\dfrac{1}{9}\)

Nguyễn Lê Phước Thịnh
28 tháng 8 2021 lúc 21:28

1: \(\left(2x+3\right)^2=4x^2+12x+9\)

\(\left(3x+2\right)^2=9x^2+12x+4\)

\(\left(2x+5\right)^2=4x^2+20x+25\)

\(\left(2x+\dfrac{1}{3}\right)^2=4x^2+\dfrac{4}{3}x+\dfrac{1}{9}\)

\(\left(3x+\dfrac{1}{3}\right)^2=9x^2+2x+\dfrac{1}{9}\)