Câu 1:

a) = (a*a+1)-(2*a-1)/a

b) $\text2(a+b+c)-\frac{x(a-b)}{y}$

Câu 2: Đề thiếu

Câu 3:

program C3;
uses crt;
var a,b,T:integer;
Begin
    clrscr;
    write('Nhap a: ');readln(a);
    write('Nhap b: ');readln(b);
    T:=a+b;
    write('Tong hai so = ',T);
    readln;
End.

Câu 4:

a) = 1/(b+2)*(a*a+c)=5

b) = k*k+(k+1)*(k+1)<>(k+2)*(k+2)

c) = 8*x-7>1

d) = b*b-4*a*c>=0

d) = (1/n)*(1/(n+1))*(1/(n+2))<0.01

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

f) = (a+c)*h/2<>1

g) = 2*x+3<=25*y

k) = x>=(m+5)/(2*a)

i) = 3.14*R*R>a*a

Câu 5:

program C5;
uses crt;
var r,dt,cv:real;
Begin
    clrscr;
    write ('Nhap ban kinh R= ');readln(r);
    dt:=pi*r*r;
    cv:=2*pi*r;
    writeln('Dien tich hinh tron la: ',dt:2:2);
    writeln('Chu vi hinh tron la: ',cv:2:2);
    readln;
End.

Câu 6:

program C6;
uses crt;
var a,b:integer;
Begin
    clrscr;
    write('Nhap a: ');readln(a);
    write('Nhap b: ');readln(b);
    if a>b then write('a la so lon nhat')
    else write('b la so lon nhat');
    readln;
End.