K
Khách

Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.

23 tháng 12 2023

Câu 16:

a: Xét tứ giác MDHE có

\(\widehat{MDH}=\widehat{MEH}=\widehat{EMD}=90^0\)

=>MDHE là hình chữ nhật

b: Ta có: MDHE là hình chữ nhật

=>MH cắt DE tại trung điểm của mỗi đường và MH=DE

=>O là trung điểm chung của MH và DE

Ta có: MH=DE

mà DE=6cm

nên MH=6cm

Ta có: ΔHMP vuông tại H

=>\(HM^2+HP^2=MP^2\)

=>\(MP^2=6^2+8^2=100\)

=>\(MP=\sqrt{100}=10\left(cm\right)\)

Xét ΔHMP có

O,A lần lượt là trung điểm của HM,HP

=>OA là đường trung bình của ΔHMP

=>OA//MP và \(OA=\dfrac{MP}{2}=5\left(cm\right)\)

c: MDHE là hình chữ nhật

=>\(\widehat{DEH}=\widehat{DMH}\)

mà \(\widehat{DMH}=\widehat{P}\left(=90^0-\widehat{N}\right)\)

nên \(\widehat{DEH}=\widehat{P}\)

Ta có: ΔPEH vuông tại E

mà EA là đường trung tuyến

nên AE=AH

=>\(\widehat{AEH}=\widehat{AHE}\)

Ta có: \(\widehat{AED}=\widehat{AEH}+\widehat{DEH}\)

\(=\widehat{AHE}+\widehat{P}=90^0\)

=>ΔAED vuông tại E

23 tháng 12 2023

cậu vẽ hình nx đk ko

4 tháng 10 2023

loading...  

Mn ơi giúp mình với ạ11.Which one is correct a. I have been brought up by my parents since my birthb. My parents have been brought me up since my birthc. My parents have broug me up since my birthd. a or c12. Which one is correct?a. English is world-wide used.b. People use English world-widec. English uses world-wided. a or b13. Which one is correct?a. This language is being spoken nowb. They have spoken this language nowc. People are being spoken this language nowd. all are correct14....
Đọc tiếp

Mn ơi giúp mình với ạ

11.Which one is correct 

a. I have been brought up by my parents since my birth

b. My parents have been brought me up since my birth

c. My parents have broug me up since my birth

d. a or c

12. Which one is correct?

a. English is world-wide used.

b. People use English world-wide

c. English uses world-wide

d. a or b

13. Which one is correct?

a. This language is being spoken now

b. They have spoken this language now

c. People are being spoken this language now

d. all are correct

14. Which one is correct?

a. Smoking must to be banned

b. Smoking must ban

c. Smoking must be banned

d. Smoking must be banning

15.My mom made this cake. Means:

a. This cake is made by my mom

b. This cake made my mom

c. This cake was made by my mom

d. This cake was made by my mom

16.Many people think.......she is my sister

a. why

b. that

C. X

d. a or c

17. I believe that they....rich before

a. are

b. to be

c. is

d. we're

18. They......that the flood destroyed all

a. says

b. said

c. told me

d. b or c

19. She told the people that there.....nothing left

a. is 

b. were

c. was

d. be

20. I want to know......I can get to the Middle?

a. how

b. that

c. when

d. a or c

2
11 tháng 1

11.d

12.b

13.a

14.c

15.c

16.d

17.b

18.d

19.c

20.d

11 tháng 1

11.Which one is correct 

a. I have been brought up by my parents since my birth

b. My parents have been brought me up since my birth

c. My parents have brought me up since my birth

d. a or c

12. Which one is correct?

a. English is world-wide used.

b. People use English world-wide

c. English uses world-wide

d. a or b

13. Which one is correct?

a. This language is being spoken now

b. They have spoken this language now

c. People are being spoken this language now

d. all are correct

14. Which one is correct?

a. Smoking must to be banned

b. Smoking must ban

c. Smoking must be banned

d. Smoking must be banning

15.My mom made this cake. Means:

a. This cake is made by my mom

b. This cake made my mom

c. This cake was made by my mom

d. This cake was made by my mom

16.Many people think.......she is my sister

a. why

b. that

C. X

d. a or c

17. I believe that they....rich before

a. are

b. to be

c. is

d. were

18. They......that the flood destroyed all

a. says

b. said

c. told me

d. b or c

19. She told the people that there.....nothing left

a. is 

b. were

c. was

d. be

20. I want to know......I can get to the Middle?

a. how

b. that

c. when

d. a or c

23 tháng 1 2020

Ta có :

\(\frac{a}{b}=\frac{5}{3}=\frac{150}{90}\)\(\frac{b}{c}=\frac{15}{35}=\frac{90}{210}\)\(\frac{c}{d}=\frac{6}{11}=\frac{210}{385}\)

Từ đây có thể nhận thấy : \(a\div b\div c\div d=150\div90\div210\div385\)

Để a;b;c;d là các số tự nhiên nhỏ nhất :

\(\Leftrightarrow\)\(a=150\)

          \(b=90\)

          \(c=210\)

          \(d=385\)

24 tháng 1 2020

Rất cảm ơn bạn tên đăng nhập là tiếng núơc ngoài

13 tháng 2 2019

Đáp án B

16 tháng 1 2022

PTHH : 2Al     +     6HCl  --> 2AlCl3   +    3H2 ↑   (1)

nAlCl3 = \(\dfrac{m}{M}=\dfrac{13,35}{27+35,5.3}=0.1\left(mol\right)\) 

Từ (1) => nHCl   =   2nH2  = 0.2 (mol)

=> mHCl = n.M  =  0.2 x  36.5 = 7.3 (g)

16 tháng 1 2022

\(PTHH:2Al+6HCl\rightarrow2AlCl_3+3H_2\\ n_{AlCl_3}=\dfrac{m}{M}=\dfrac{13,35}{133,5}=0,1\left(mol\right)\\ Theo.PTHH:n_{HCl}=3.n_{AlCl_3}=3.0,1=0,3\left(mol\right)\\ m_{HCl}=n.M=0,3.36,5=10,95\left(g\right)\)