นิพจน์ 3: Start sum from "n" equals 1 to "i" , end sum, StartFraction, left parenthesis, "n" ln left parenthesis, "x" , right parenthesis , right parenthesis Superscript, left parenthesis, "n" minus 1 , right parenthesis , Baseline Over "n" ! , EndFraction left brace, "e" Superscript, negative StartFraction, 1 Over "e" , EndFraction , Baseline less than or equal to "x" less than or equal to "e" Superscript, StartFraction, 1 Over "e" , EndFraction , Baseline , right brace มีกราฟ กด ALT+T เพื่อการอ่านออกเสียงi∑n=1nlnxn−1n!e−1e≤x≤e1e
