Câu 1 :

a) a*x*x*x + b*x*x +c*x + d

b) (a - 3)*(a + 5) = 0

c) 1/n + 1/(n + 1) + 1/(n + 2) < 0.01

d) 1/sqr(1 + x) - 2/(sqr(x) + 1)

Câu 2 :

program tinh;

uses crt;

var a, b : integer;

begin

clrscr; 

write('nhap so a :');readln(a);

write('nhap so b :');readln(b);

writeln('gia tri cua a la :', a);

writeln('gia tri cua b la :', b);

readln

end.

Câu 3 :

program tinh;

uses crt;

var a, b : integer;

begin

clrscr;

write('nhap so a :');readln(a);

write('nhap so b :');readln(b);

writeln('tong cua a va b la  :', a + b);

writeln('hieu cua a va b la :', a - b);

readln

end.