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1 tháng 8 2019

Bn ơi cho mk hr đề cs p là thế này ko :

\(3x^2+5x8-2x^2+4x+6=0\)

1 tháng 8 2019

em xin phép xóa nhé !

29 tháng 11 2018

Đây là câu hỏi Toán mà bạn?

Bài 1: Cho A=2x+15x√+18x+3x√–18+3x+4x√+12x–3x√–5–8x–15x√2xx√–11x+15x√1) Rút gọn biểu thức2) Tính A tại x=2+5–√−−−−−−√3+2–5–√−−−−−√3Bài 2:1) Tìm tất cả các số tự nhiên n sao cho số n4–3n2+1 là số nguyên tố.2) Tìm tất cả các số tự nhiên x;y sao cho x2+16x+1=y2.Bài 3:1) Giải phương trình: x+1−−−−−√+2x+2=x–1+1–x−−−−√+31–x2−−−−√2)...
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Bài 1: Cho A=2x+15x√+18x+3x√–18+3x+4x√+12x–3x√–5–8x–15x√2xx√–11x+15x√
1) Rút gọn biểu thức
2) Tính A tại x=2+5–√−−−−−−√3+2–5–√−−−−−√3
Bài 2:
1) Tìm tất cả các số tự nhiên n sao cho số n4–3n2+1 là số nguyên tố.
2) Tìm tất cả các số tự nhiên x;y sao cho x2+16x+1=y2.
Bài 3:
1) Giải phương trình: x+1−−−−−√+2x+2=x–1+1–x−−−−√+31–x2−−−−√
2) Cho a,b,c không âm thỏa mãn a+b+c=3.
a) Chứng minh rằng: a2+3a+5−−−−−−−−−√≥5a+136
b) Tìm giá trị nhỏ nhất của a2+3ab+5b2−−−−−−−−−−−−√+b2+3bc+5c2−−−−−−−−−−−√+c2+3ca+5a2−−−−−−−−−−−−√
Bài 4: Cho hình vuông ABCD có tâm là O. Điểm E thuộc cạnh BC. Gọi F là giao điểm của tia AE và đường thẳng CD. G là giao điểm của DE và BF.
a) Chứng minh rằng 1AE2+1AF2=1AB2

b) Chứng minh CG⊥AF
c) Gọi H là giao điểm của OE và BF. Tìm vị trí của điểm E để diện tích tam giác HAD đạt giá trị lớn nhất.
Bài 5: Có bảy số 0 và một số 1 được điền vào 8 đỉnh của một hình lập phương (mỗi số điền vào 1 đỉnh). Mỗi bước thay đổi số là cộng thêm 1 vào các số ở cùng 1 cạnh nào đó của hình lập phương trên. Hỏi có thể thu được tất cả các số ở cả 8 đỉnh đều bằng nhau không? Vì sao?

 

1
6 tháng 7 2018

ủa bạn cái này phải là toán lớp 9 mới đúng chứ!

     2 câu thôi nhé!!!

b.\(x-2\sqrt{x}=\sqrt{x}\left(\sqrt{x}-2\right)\) 

c.\(\sqrt{x}-3x=\sqrt{x}\left(1-3\sqrt{x}\right)\)

Part 2:. Supply the correct form of verbs in the blank. (1,0 point) A new model computer (1) __________ (design) and supposed to be invading foreign markets at the present. 2. The car broke down. But for that we (2) __________ (be) in time. 3. I didn’t see anyone , but I felt as though I (3) __________ (watch). 4. But for my parents’attention to my study in the early childhood, I (4) __________ (not pass) all the examinations (5) __________ (become ) a teacher of...
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Part 2:. Supply the correct form of verbs in the blank. (1,0 point)

  1. A new model computer (1) __________ (design) and supposed to be invading foreign markets

at the present.

2. The car broke down. But for that we (2) __________ (be) in time.

3. I didn’t see anyone , but I felt as though I (3) __________ (watch).

4. But for my parents’attention to my study in the early childhood, I (4) __________ (not pass) all

the examinations (5) __________ (become ) a teacher of English as I am today.

5. It is advisable that we (6) __________ (be) economical in the economic recession.

6. I’ll phone you at eight . – No, I (7) __________ (watch) a football match then.

7. He’s intelligent and he (8) __________ (work) hard so far. He (9) __________ (pass) the exam,

I think.

8. He became addicted to smoking. He really regretted (10) __________ (not take) his father’s

advice.

Your answers:

1. ____________

2. ___________

3. ____________

4. ___________

5. ___________

6. ____________

7. ___________

8. ____________

9. ___________

10. ___________

1
2 tháng 6 2020

1. Is being designed

2. Would have been

3. Had been being watched

4. Wouldn't have passed / to become

5. Should be

6. Am going to watch

7. Has worked / is going to pass

8. Not taking

2 tháng 6 2020

thank you ban

17 tháng 7 2019

I

1. amusement

2. rider

3. pronunciation

4. sitting

5. meaning

6. complaint (n) : sự than phiền

complainant (n): nguyên đơn

7. preference

8. feeling

9. selling (n) : sự bán hàng

seller (n) : người bán hàng

10. sleep (n) : giấc ngủ

sleeper (n) : người ngủ

sleepiness (n) : sự buồn ngủ

sleeping (n) : sự dừng lại giữa đường

sleepyhead (n) : người đãng trí

sleeplessness (n) : sự mất ngủ

II.

1. heartening (a) : cổ vũ, động viên

heartfelt (a) : chân thành

heartless (a) : nhẫn tâm

hearty (a) : nồng nhiêt

2. natural

3. sleepy (a) : buồn ngủ

sleepless (a): ko ngủ

4. alive (a) : còn sống

lively (a) : sống động

5. amusable (a) : có thể giải trí đc

amusing (a) : vui, gây cười (*)

amusive (a) : để làm cho vui

6. entertaining (a) : thú vị

7. (un)looked

8. plentiful

9. mountainous

17 tháng 7 2019

I.Change these verbs into nouns

1. amusement

2. rider.

3. pronunciation

4. sitting

5. meaning

6. complaint

7. preference

8.feeling

9.selling

10.sleepiness

II.Change the nouns into adjectives

1.hearty

2.natural

3.sleepy

4.lively.

5.amusing

6.entertaining.

7.looked.

8.plentyiful

9.mountainous

Part 3: Give the correct forms of words at the end of the lines to fill in the gaps.( 2,0 pts) TOP TIPS FOR WRITERS Finding an accurate (1) ___________ from one language to another is not always easy and the job of an interpreter can be (2) ___________. Many (3) ___________ in one language don’t work in another language and trying to give a good idea of what a (4) ___________ wants to say can be difficult. The most important thing is that no (5) ___________ should be lost....
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Part 3: Give the correct forms of words at the end of the lines to fill in the gaps.( 2,0 pts)

TOP TIPS FOR WRITERS

Finding an accurate (1) ___________ from one language to another is not always easy and the job of an interpreter can be (2) ___________. Many (3) ___________ in one language don’t work in another language and trying to give a good idea of what a (4) ___________ wants to say can be difficult. The most important thing is that no (5) ___________ should be lost. The interpreter has to have complete (6) ___________ that they understand the message and their (7) ___________ language has to be very good. Interpreters can provide a real (8) ___________ for people who speak (9) ___________ languages. They are certainly an important part of international (10) ___________.

TRANSLATE

PREDICT

EXPRESS

SPEAK

INFORM

CERTAIN

SPEAK

CONNECT

DIFFER

COMMUNICATE

Your answers:

1. ______________

2. ______________

3. _____________

4. ______________

5. ______________

6. _______________

7. ______________

8. ______________

9. ______________

10. ______________

1
4 tháng 6 2020

Part 3: Give the correct forms of words at the end of the lines to fill in the gaps.( 2,0 pts)

TOP TIPS FOR WRITERS

Finding an accurate (1) translation from one language to another is not always easy and the job of an interpreter can be (2) unpredictable. Many (3) expressions in one language don’t work in another language and trying to give a good idea of what a (4) speaker wants to say can be difficult. The most important thing is that no (5) information should be lost. The interpreter has to have complete (6) certainty that they understand the message and their (7) spoken language has to be very good. Interpreters can provide a real (8) connection for people who speak (9) different languages. They are certainly an important part of international (10) communication.

TRANSLATE

PREDICT

EXPRESS

SPEAK

INFORM

CERTAIN

SPEAK

CONNECT

DIFFER

COMMUNICATE

Wherever we think of an English man, we often (1)_____him with an obsession with tea drinking. Tea has been a huge part o English and British culture up to now. If you want to make tea in the way (2)______millions of English do it everyday, you(3)______consider following these steps. First of all, you need to pick you tea, ideally by going to a tea store and buying(4)_____good quality brand of tea. Once you get your tea. You have your tea bag ready in a mug while boiling the water. In the next...
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Wherever we think of an English man, we often (1)_____him with an obsession with tea drinking. Tea has been a huge part o English and British culture up to now. If you want to make tea in the way (2)______millions of English do it everyday, you(3)______consider following these steps. First of all, you need to pick you tea, ideally by going to a tea store and buying(4)_____good quality brand of tea. Once you get your tea. You have your tea bag ready in a mug while boiling the water. In the next step, you pour boiling water over the teabag and (5)______briefly. The tea needs (6)______time to develop its flavor so you have to wait 3 to 5 minutes for a pot. After that, you remove the teabag and add (7)______ milk. If you want to achieve the classic taste of British tea, you(8)_____ use fully sterilized milk. Now it's time to enjoy your tea as an English.

1. A, connect. B, link. C, associate. D, match.

2. A,a B,some. C, any. D, 0

3. A, must. B, might. C, have. D, would

4. A, a. B, some. C, any. D, 0

5. A, stir. B, whisk. C, great. D, chop

6. A, a. B, some. C, any. D, 0

7. A, a. B, some. C, any. D, 0

8. A, will. B, should. C, would. D, could.

0