運算式 4: "m" equals StartFraction, left parenthesis, "f" left parenthesis, "a" plus "h" , right parenthesis minus "f" left parenthesis, "a" , right parenthesis , right parenthesis Over "h" , EndFractionm=fa+h−fah
equals=
5050
4
運算式 5: "y" equals "m" left parenthesis, "x" minus "a" , right parenthesis plus "f" left parenthesis, "a" , right parenthesisy=mx−a+fa
5
隱藏的 標籤 left parenthesis, "a" , "f" left parenthesis, "a" , right parenthesis , right parenthesisa,fa
標籤
equals=
left parenthesis, 0 , 0 , right parenthesis0,0
6
隱藏的 標籤 left parenthesis, "a" plus "h" , "f" left parenthesis, "a" plus "h" , right parenthesis , right parenthesisa+h,fa+h
標籤
equals=
left parenthesis, 20 , 1000 , right parenthesis20,1000
