運算式 5: "y" less than or equal to negative natural log left parenthesis, negative "x" , right parenthesis left brace, "x" greater than or equal to negative "e" , right bracey≤−ln−xx≥−e
5
運算式 6: "y" less than or equal to StartFraction, 1 Over "e" , EndFraction "x" left brace, "x" less than or equal to negative "e" , right bracey≤1exx≤−e
