program sg(input,output);
var
v,a,t:integer;
Vt,Vz,s:real;
begin
readln(v,a,t);
Vt:=v+a*t;
Vz:=(v+Vt)/2;
s:=v*t+a*t*t/2;
writeln(\'s=\',s:5,\' \',\'Vt=\',Vt:5,\' \',\'Vz=\',Vz);
end.
20*2+10=50m/s
10*20+(1+19)*19/2*2=580m
580/20=29m/s
递推