表达式3: left parenthesis, StartRoot, left parenthesis, StartFraction, left parenthesis, "e" minus 1 , right parenthesis left parenthesis, "e" Superscript, left parenthesis, negative "t" plus 1 , right parenthesis , Baseline minus 1 , right parenthesis Over pi "e" Superscript, left parenthesis, negative "t" plus 1 , right parenthesis , Baseline , EndFraction , right parenthesis , EndRoot , StartFraction, left parenthesis, "e" Superscript, left parenthesis, negative "t" plus 1 , right parenthesis , Baseline minus 1 , right parenthesis Over "e" minus 1 , EndFraction , right parenthesise−1e−t+1−1πe−t+1,e−t+1−1e−1
3
表达式4: "y" equals StartFraction, left parenthesis, "e" Superscript, left parenthesis, negative "t" plus 1 , right parenthesis , Baseline minus 1 , right parenthesis Over "e" minus 1 , EndFraction left brace, 0 less than or equal to "x" less than or equal to StartRoot, left parenthesis, StartFraction, left parenthesis, "e" minus 1 , right parenthesis left parenthesis, "e" Superscript, left parenthesis, negative "t" plus 1 , right parenthesis , Baseline minus 1 , right parenthesis Over pi "e" Superscript, left parenthesis, negative "t" plus 1 , right parenthesis , Baseline , EndFraction , right parenthesis , EndRoot , right bracey=e−t+1−1e−10≤x≤e−1e−t+1−1πe−t+1
