Câu 3

Var st:string;

i,d:integer;

Begin

Write('Nhap xau ky tu ');readln(st);

For i:=1 to length(st) do

If st[i] in ['0'..'9'] then d:=d+1;

Write('Co ',d,' ky tu so');

Readln

End.

Câu 4

Var a:array[1..1000] of integer;

i,n:integer;

Begin

Write('n = ');readln(n);

For i:=1 to n do

Begin

Write('Nhap so thu ',i);readln(a[i]);

End;

Write('Cac so chia het cho 3 hoac 5 la: ');

for i:=1 to n do

If (a[i] mod 3 = 0) or (a[i] mod 5 = 0) then write(a[i]:8);

Readln

End.

2.1) \(\left\{{}\begin{matrix}2x+\dfrac{1}{\sqrt{y}}=3\left(1\right)\\x-\dfrac{1}{\sqrt{y}}=0\left(2\right)\end{matrix}\right.\left(y\ne0\right)\)

Lấy \(\left(1\right)+\left(2\right)\Rightarrow3x=3\Rightarrow x=1\Rightarrow\dfrac{1}{\sqrt{y}}=1\Rightarrow y=1\)

P6:

1. big

2. been

3. bought

4. people

P7:

1. T

2. F

3. F

4. F

Câu 16

B

Câu17

C

b=>go

b=>and

1. went => to go 

2. but => and

1 B -> go

2 B => and

8 How much do these apples cost?

9 THis is a blue car

11 Are there 40 classrooms in Phong's school?

13 How wide if the Great wall