表达式4: "f" left parenthesis, "x" , right parenthesis equals 1 fourth "x" squared plus "x" squared left brace, 0 less than or equal to "x" less than or equal to 3 , right bracefx=14x2+x20≤x≤3
4
表达式5: "f" left parenthesis, "x" , right parenthesis equals negative left parenthesis, "x" minus 2 , right parenthesis squared plus 4 left parenthesis, "x" minus 2 , right parenthesis plus 4 left brace, 2 less than or equal to "x" less than or equal to 6 , right bracefx=−x−22+4x−2+42≤x≤6
5
表达式6: "f" left parenthesis, "x" , right parenthesis equals 1 third left parenthesis, "x" minus 6 , right parenthesis to the 5th power minus 1 half left parenthesis, "x" minus 6 , right parenthesis cubed plus 9 left parenthesis, "x" minus 6 , right parenthesis squared minus 1 fourth left parenthesis, "x" minus 6 , right parenthesis plus 4 left brace, 6 less than or equal to "x" less than or equal to 7 , right bracefx=13x−65−12x−63+9x−62−14x−6+46≤x≤7
6
表达式7: "f" left parenthesis, "x" , right parenthesis equals 1 fourth left parenthesis, "x" minus 7 , right parenthesis to the 4th power minus left parenthesis, "x" minus 7 , right parenthesis cubed plus 12.5 8 3 left brace, 11 greater than or equal to "x" greater than or equal to 7 , right bracefx=14x−74−x−73+12.58311≥x≥7
