Tick mình( bài 2):
program ptbnhat;
uses crt;
var a, b: longint;
Begin
write('Nhap so a ='); readln(a);
write('Nhap so b ='); readln(b);
If (a = 0) and (b = 0)
then writeln ('Phuong trinh co nghiem x thuoc R')
else
if (a=0) and (b<>0) then writeln('Phuong trinh vo nghiem')
else
writeln(Nghiẹm la x= ' -b/a);
readln
end.