1 Tom asked which book I had taken

2 I asked her when she was coming back

3 Mary asked when I had telephoned my mother

4 Ann asked how long the train took

5 She asked how far I had to walk

6 He asked what I was doing

7 The teacher asked him why he was so late

8 We asked what time the plane arrived

9 My father asked me why I hadn't phoned

10 He asked her where she stayed in Paris

11 My father asked me who I had seen at the meeting

12 I asked her where she was going

13 He asked me how I was

14 She asked how I had gone to school

15 Ann says he was tired

16 Tom said New York is bigger than London

17 I asked him where he had put it

18 They asked where my school was

19 Bill asks me where he will go tomorrow

20 Mary asked me when I had picked Ann up

21 John asked when the teacher would get back

22 William said he wouldn't visit her again

23 John said he had finished studying his lesson

24 The man said the clock would never work again if I tried to repair it

25 Mary told John she couldn't go to the movies with him

uses crt;

var st:array[1..100]of string;

a,b,c:array[1..100]of real;

i,n:integer;

max:real;

begin

clrscr;

readln(n);

for i:=1 to n do readln(st[i],a[i],b[i],c[i]);

max=(a[1]+b[1]+c[1])/3;

for i:=1 to n do 

if (max<(a[i]+b[i]+c[i])/3) then max:=(a[i]+b[i]+c[i])/3;

writeln(max:4:2);

readln;

end.

\(Cl_2+H_2\rightarrow2HCl\)

\(Zn+2HCl\rightarrow ZnCl_2+H_2\)

\(ZnCl_2+Ba\left(OH\right)_2\rightarrow Zn\left(OH\right)_2+BaCl_2\)

\(Zn\left(OH\right)_2+2HCl\rightarrow ZnCl_2+2H_2O\)

\(a) Fe + 2HCl \to FeCl_2 + H_2\\ b) n_{Fe} = n_{H_2} = \dfrac{2,24}{22,4} = 0,1(mol)\\ m_{Fe} = 0,1.56 = 5,6(gam)\\ n_{Cu} = 12-5,6 = 6,4(gam)\)

\(Fe+2HCl\rightarrow FeCl_2+H_2\)

\(Cu+HCl\) \(\rightarrow\)không phản ứng

\(n_{H_2}=\dfrac{2.24}{22.4}=0.1\)

\(m_{Fe}=0.1\cdot56=5.6g\)

\(m_{Cu}=12-5.6=6.4g\)

Nếu đề hỏi nhận định nào sai thì đáp án D là nhận định sai, vì theo đề thì $c$ là phần tử nằm trong tập hợp M

giúp mình đii

Lời giải:
Thời gian 2 người đi cho đến khi gặp nhau là:

$54:30=1,8$ (giờ)

Quãng đường người thứ hai đi cho đến khi gặp người đi từ A là:

$1,8\times 20=36$ (km)

Quãng đường AB dài: $54+36=90$ (km)

Lời giải:
Thời gian 2 người đi cho đến khi gặp nhau là:

$54:30=1,8$ (giờ)

Quãng đường người thứ hai đi cho đến khi gặp người đi từ A là:

$1,8\times 20=36$ (km)

Quãng đường AB dài: $54+36=90$ (km)

Lời giải:
Thời gian 2 người đi cho đến khi gặp nhau là:

$54:30=1,8$ (giờ)

Quãng đường người thứ hai đi cho đến khi gặp người đi từ A là:

$1,8\times 20=36$ (km)

Quãng đường AB dài: $54+36=90$ (km)

Mik xin lỗi, mik đọc sai đềMik giải lại nhé

\(xOy+x'Oy'=248^0\)

mà \(xOy=x'Oy'\) (2 góc đối đỉnh)

\(\Rightarrow xOy=x'Oy'=\frac{248^0}{2}=124^0\)

\(xOy+xOy'=180^0\) (2 góc kề bù)

\(124^0+xOy'=180^0\)

\(xOy'=180^0-124^0\)

\(xOy'=56^0\)

Chúc bạn học tốt

\(xOy+x'Oy'=248^0\)

mà \(xOy=x'Oy'\) (2 góc đối đỉnh)

\(\Rightarrow xOy=x'Oy'=\frac{248^0}{2}=124^0\)

Vậy \(x'Oy'=124^0\)

Chúc bạn học tốt