運算式 4: "h" left parenthesis, "x" , right parenthesis equals StartFraction, "d" Over "d" "x" , EndFraction "g" left parenthesis, "x" , right parenthesishx=ddxgx
4
運算式 5: "m" left parenthesis, "x" , right parenthesis equals StartFraction, "d" Over "d" "x" , EndFraction "f" left parenthesis, "x" , right parenthesismx=ddxfx