表达式6: "v" prime left parenthesis, "x" , right parenthesisv′x
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表达式7: "y" equals "v" left parenthesis, 4 thirds "r" , right parenthesisy=v43r
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表达式8: "x" equals 4 thirds "r" left brace, negative "f" left parenthesis, 4 thirds "r" , right parenthesis less than "y" less than "f" left parenthesis, 4 thirds "r" , right parenthesis , right bracex=43r−f43r<y<f43r
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表达式9: "v" Subscript, "m" "a" "x" , Baseline equals left parenthesis, StartFraction, 32 Over 81 , EndFraction , right parenthesis times pi times "r" cubedvmax=3281·π·r3
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表达式10: "c" left parenthesis, "x" , right parenthesis equals StartFraction, "f" left parenthesis, 4 thirds "r" , right parenthesis Over 4 thirds "r" , EndFraction times "x" left brace, 0 less than "x" less than 4 thirds "r" , right bracecx=f43r43r·x0<x<43r
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表达式11: negative "c" left parenthesis, "x" , right parenthesis−cx
