表达式8: "y" equals "f" prime left parenthesis, "x" , right parenthesis left brace, "y" less than 0 , right bracey=f′xy<0
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表达式9: "y" equals "f" prime left parenthesis, "x" , right parenthesis left brace, "y" greater than 0 , right bracey=f′xy>0
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表达式10:
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表达式11:
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表达式12:
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表达式13: "f" prime prime prime left parenthesis, "x" , right parenthesisf′′′x
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表达式14: "y" equals negative StartFraction, 8 left parenthesis, "x" plus 5 , right parenthesis Over 27 "x" Superscript, 8 thirds , Baseline , EndFractiony=−8x+527x83
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表达式15: "f" prime prime prime left parenthesis, 0 , right parenthesisf′′′0
