Câu 1:

a. 2*x*y+x*x>=0

b. sqr(m+n)<>m*m+n*n

Câu 2:

program dt_hinh_thang;

uses crt;

  var a, b, h, dt;

begin

  clrscr;

  write('Nhap a = '); readln(a);

  write('Nhap b = '); readln(b);

  write('Nhap h = '); readln(h);

  dt:=(a+b)/2*h;

  writeln('Dien tich hinh thang do la: ', dt);

  readln

end.

Câu 1:

a. 2*x*y+x*x>=0

b. sqr(m+n)<>m*m+n*n

Câu 2:

program dt_hinh_thang;

uses crt;

  var a, b, h, dt;

begin

  clrscr;

  write('Nhap a = '); readln(a);e

  write('Nhap b = '); readln(b);x

  write('Nhap h = '); readln(h);c

  dt:=(a+b)/2*h;s

  writeln('Dien tich hinh thang do la: ', dt);

  readlnerlska

end.