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program text;
uses crt;
var i:integer;
a,b,c,ha,hb,hc,p,S:real;
X,Y:array[1..3] of integer;
Begin
clrscr;
Writeln('Nhap toa do cac dinh A, B, C:');
for i:= 1 to 3 do readln(X[i],Y[i]);
a:=sqrt(sqr(X[2]-X[3])+sqr(Y[2]-Y[3]));
b:=sqrt(sqr(X[1]-X[3])+sqr(Y[1]-Y[3]));
c:=sqrt(sqr(X[2]-X[1])+sqr(Y[2]-Y[1]));
p:= (a+b+c)/2;
S:= sqrt(p*(p-a)*(p-b)*(p-c));
Writeln('Dien tich cua tam giac la: ',S:0:4);
ha:=2*S/a;
hb:=2*S/b;
hc:=2*S/c;
writeln('ha = ',ha:0:2,' hb = ',hb:0:2,' hc = ',hc:0:2);
readln;
end.
uses crt;
var xa,ya,xb,yb,xc,yc,p,s,ab,bc,ac:real;
begin
clrscr;
readln(xa,ya,xb,yb,xc,yc);
ab:=sqrt(sqr(xa-xb)+sqr(ya-yb));
ac:=sqrt(sqr(xa-xc)+sqr(ya-yc));
bc:=sqrt(sqr(xb-xc)+sqr(yb-yc));
p:=(ab+bc+ac)/2;
s:=sqrt(p*(p-ab)*(p-ac)*(p-bc));
writeln(s:4:2);
readln;
end.
uses crt;
var st:string;
i,d,dem:integer;
begin
clrscr;
write('Nhap xau:'); readln(st);
d:=length(st);
dem:=0;
for i:=1 to d do
if st[i]=#32 then inc(dem);
writeln(dem);
readln;
end.
uses crt;
var i,n:integer;
s:real;
begin
clrscr;
n:=1;
s:=0;
while (n<=10000) do
begin
n:=n+2;
s:=s+1/n;
end;
writeln(s:4:2);
readln;
end.
const fi='songuyen.inp';
fo='tong.out';
var f1,f2:text;
a:array[1..100]of integer;
n,i,dem:integer;
begin
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
n:=0;
while not eof(f1) do
begin
n:=n+1;
read(f1,a[n]);
end;
dem:=0;
for i:=1 to n do
if a[i] mod 2=0 then inc(dem);
writeln(f2,dem);
close(f1);
close(f2);
end.
program dung;
uses crt;
var x: integer'
t: real;
begin
clrscr;
write('x= '); readln(x);
t:=(5*x-7)+sqrt(3*x*x+7*x-6);
write('Dien tich la: ',s:1:2);
write('Ket qua: ',t);
readln;
end.
uses crt;
var a,b,x,t,i:integer;
begin
clrscr;
readln(a,b,x);
t:=0;
for i:=a to b do
if i mod x=0 then t:=t+i;
writeln(t);
readln;
end.
uses crt;
var xa,ya,xb,yb,xc,yc,p,s,ab,bc,ac:real;
begin
clrscr;
readln(xa,ya,xb,yb,xc,yc);
ab:=sqrt(sqr(xa-xb)+sqr(ya-yb));
ac:=sqrt(sqr(xa-xc)+sqr(ya-yc));
bc:=sqrt(sqr(xb-xc)+sqr(yb-yc));
p:=(ab+bc+ac)/2;
s:=sqrt(p*(p-ab)*(p-ac)*(p-bc));
writeln(s:4:2);
readln;
end.
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