表达式1: "f" left parenthesis, "x" , right parenthesis equals StartFraction, 501 Over "x" , EndFraction plus StartFraction, "x" Over 2 , EndFractionfx=501x+x2
1
表达式2: "g" left parenthesis, "x" , right parenthesis equals StartFraction, 501 Over "x" , EndFraction minus StartFraction, "x" Over 2 , EndFractiongx=501x−x2