= "§O¹N M· SAU IN KÕT QU¶ NΜỎ" "VAR A, B,S

18) = "§o¹n m· sau in kÕt qu¶ nµỏ" "var a, b,s: real;" "Begin" "a:=7;" "b:=11;" "s:=sqrt(b-a);" "writeln('s=',s);" "end." (18, 1) = "3" (18, 2) = "0" (18, 3) = “*00" (18, 4) = "2”*