8

8

program E_8;

var a,b:real;

begin write( , Enter);

readln(a,b);

writeln( =, (a+b)/2)

end.9

program E_9;var a,b:real;beginwrite( , Enter);

readln(a,b);writeln( =, abs(a-b));

end.

10program E_10;

var a,b,c,p,S:real;

begin write( , b, , Enter);

readln(a,b,c);

p:=(a+b+c)/2;

S:=sqrt(p*(p-a)*(p-b)*(p-c));

writeln(S=, S:6:2)

end.

11

program E_11;

var a:real;

begin write( , Enter);

readln(a);

writeln(S =, sqr(a))

end.

12

program E_12;

var a,b,c,S:real;

begin write( Enter);

readln(a,b);

:=sqrt(sqrt(a)+sqrt(b));

writeln(c=, c:6:2);

S:=(a+b)/2;

writeln(S=, S:6:2);

end.13

program E_13;

var a,b,c,x:real;

begin write( Enter);

readln(a,b,c);

x:=abs(a)+abs(b)+abs(c);

writeln( =, x:6:2);

end.

14

program E_14;

var l,r,S:real;

beginwrite( Enter);

readln(l);

r:=l/(2*3.14);

S:=sqr(r)*3.14;

writeln(S =, S:6:2);

end.

15

program E_15;

var a,S:real;

beginwrite( Enter);

readln(a);

S:=(sqr(a))/2;

writeln(S =, S:6:2);

end.

16

program E_16;

var a,x:real;

begin write( Enter);

readln(a);

x:=sqr(sqr(a));

writeln( 4- =, x:6:2);

end.17

program E_17;

var a,x:real;

begin write( Enter);

readln(a);

x:=a*((sqr(a))*(sqr(a))*(sqr(a)));

writeln( 7- =, x:6:2);

end.

18

program E_18;

var l,M,F,t:real;

begin write( i l, S1, S2 Enter);

readln(l,M,F);

t:=l*(M+F);

writeln(t =, t:6:2);

end.

19

program E_19;

var a,d,n,s:real;

beginwrite( , Enter);

readln(a,d,n);

S:=(2+a+d*(n-1))*n/2);

writeln(S =, S:6:2);

end.