運算式 14: "d" "o" "n" prime "t" "l" "o" "o" "k" "b" "e" "l" "o" "w" 抱歉，系統無法理解這個微分符號的用法。don′tlookbelow
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運算式 15: "x" equals "x" Subscript, 1 , Baseline left brace, "y" Subscript, 1 , Baseline minus "v" less than "y" less than "y" Subscript, 1 , Baseline plus "v" , right brace 有圖檔。 要進行圖形閱讀，請按 Alt + T 鍵。x=x1y1−v<y<y1+v
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運算式 16: "y" equals "y" Subscript, 1 , Baseline left brace, "x" Subscript, 1 , Baseline minus "h" less than "x" less than "x" Subscript, 1 , Baseline plus "h" , right brace 有圖檔。 要進行圖形閱讀，請按 Alt + T 鍵。y=y1x1−h<x<x1+h
