1.You / smoke / you / get yellow teeth

=> If you smoke, you get yellow teeth

2.Children / play outside / they / not get overweight. 

=> If the children not play outside, they not get overweight

3.You / heat ice / it / melt.

=> If you heat ice, it melt

4.I /speak to john / he / get annoyed. 

=> If I speak to John, he get annoyed

5.Lots of people / come/ Jenny / have a party.

=> if lots of people come, Jenny has a party 

6.I / feel good the next day / I / go to bed early.

=> I feel good the next day, if I go to bed early

7.She / buy expensive clothes / she / go shopping.

=> She buy expensive clothes if she go shopping

8.My daughter / pass her exams / she / work hard.

=> My daughter passed her exam because she had worked hard.

9.David / be sick / he / drink milk

=> David'll be sick if he drinks milk.

10.The river / freeze / it / be very cold.

=> The river froze because it was very cold.

11.I / to visit the museums / I / be in a new city.

=> I would to visit the museums if I was in a new city.

12.I / cycle to work / the weather / be fine.

=> I will cycle to work if the weather is fine.

13.My flatmate / clean it really well / she / clean the house.

=> My flatmate cleans it very well when she is cleaning the house.

14.Everybody / be grumpy / it / rain a lot.

=> Everybody will be grumpy if it rains a lot.

1. If you smoke, you'll get yellow tooth.

2. Children should play outside if they don't want to get overweight.

3. If you heat ice, it melts.

4. If I speak to John, he'll be annoyed.

5. Lots of people came to Jenny's house to have a party.

6. If I want to feel good the next day, I should go to bed early.

7. She bought expensive clothes while she was going shopping.

8. My daughter passed her exam because she had worked hard.

9. David'll be sick if he drinks milk.

10. The river froze because it was very cold.

11. I would to visit the museums if I was in a new city.

12. I will cycle to work if the weather is fine.

13. My flatmate cleans it very well when she is cleaning the house.

14. Everybody will be grumpy if it rains a lot.

dễ quá hong nói đou:))

Ơ, là sao?

Chưa cho phép tính nữa mà đã ra đề rồi

Vậy mà cũng nói 

Haizzzz...Thật là khó hiểu

- -

_

\(A=x^3-3x^2+3x-1\\ A=x^3-3x^2.1+3x.1^2-1^3\\ A=\left(x-1\right)^3\)

Thay x=101 vào biểu thức trên ta được kết quả là 100^3= 1000000

Khi x= 101

\(A=x^3-3x^2-3x-1\)

\(\Rightarrow A=101^3-3.101^2-3.101-1\)

\(\Rightarrow A=999394\)

tíc mình nha

1,Ta có: Tam giác ABC là tam giác vuông cân 
=> AB=AC 
Mặt khác có: 
mà 
=>
Lại có:Tam giác HBA vuông tại H và tam giác KAC vuông tại K 
Từ ;; => tam giác HBA = tam giác KAC﴾Ch‐gn﴿
=>BH=AK﴾đpcm﴿
2,Ta có:AM là trung tuyến của tam giác cân => AM cũng là đường cao
Mặt khác: 
mà 
=> 
=> Tam giác AHM=tam giác CKM ﴾c.g.c﴿ vì
Có:AM=MC﴾AM là trung tuyến ứng với cạnh huyền﴿
AH=CK ﴾câu a﴿
=>MH=MK  và   
Ta có: ﴾AM là đường cao﴿
Từ ;=> 
=> Góc HMK vuông 
Kết hợp ;=> MHK là tam giác vuông cân

u bai nay lop 7 ma

Bạn tham khảo bài giải của mình ở link sau nhé,chỉ cần gạch bỏ BH = AK là xong : olm.vn/hoi-dap/question/779590.html

tớ thấy dấu = xảy ra nó có chút vấn đề cậu ạ

dấu bằng khi a=b=c=2 là đúng

Với \(x\ne0;x\ne-1\)

\(A=\frac{x}{x+1}-\frac{2}{x}+\frac{2}{x^2+x}\)

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

Ta có : \(\left|A\right|=\left|\frac{x-2}{x+2}\right|=\frac{1}{2}\)

* TH1 : \(\frac{x-2}{x+2}=\frac{1}{2}\Rightarrow2x-4=x+2\Leftrightarrow x=6\)( tm )

* TH2 : \(\frac{x-2}{x+2}=-\frac{1}{2}\Rightarrow2x-4=-x-2\Leftrightarrow3x=2\Leftrightarrow x=\frac{2}{3}\)

a)  Xét  \(\Delta ADB\) và    \(\Delta AEC\)  co:

\(\widehat{ADB}=\widehat{AEC}=90^0\)

\(\widehat{A}\)   CHUNG

Suy ra:   \(\Delta ADB~\Delta AEC\)

b)  Xét   \(\Delta EHB\)  và     \(\Delta DHC\) có:

\(\widehat{HEB}=\widehat{HDC}=90^0\)

\(\widehat{EHB}=\widehat{DHC}\)  (đối đỉnh)

suy ra:   \(\Delta EHB~\Delta DHC\)

\(\Rightarrow\)\(\frac{EH}{DH}=\frac{HB}{HC}\)

\(\Rightarrow\)\(HB.DH=HC.HE\)