運算式 2: "g" left parenthesis, "x" , right parenthesis equals 3 minus "x"gx=3−x
2
運算式 3: "f" left parenthesis, "x" , right parenthesis equals left brace, "x" less than 2 : "h" left parenthesis, "x" , right parenthesis , "x" greater than or equal to 2 : "g" left parenthesis, "x" , right parenthesis , right bracefx=x<2:hx,x≥2:gx
