表达式2: "g" left parenthesis, "x" , right parenthesis equals 3 minus "x"gx=3−x
2
表达式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 brace 有图表。 要进行音频跟踪，按“Alt 键 + T”。fx=x<2:hx,x≥2:gx
