表达式6: polygon left parenthesis, left parenthesis, "I" , 0 , right parenthesis , left parenthesis, "I" plus "n" , 0 , right parenthesis , left parenthesis, "I" plus "n" , "f" left parenthesis, "I" plus StartFraction, "n" Over 2 , EndFraction , right parenthesis , right parenthesis , left parenthesis, "I" , "f" left parenthesis, "I" plus StartFraction, "n" Over 2 , EndFraction , right parenthesis , right parenthesis , right parenthesispolygonI,0,I+n,0,I+n,fI+n2,I,fI+n2
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表达式7:
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表达式8:
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表达式9:
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表达式10: "x" equals "I" left brace, 0 less than "y" less than "I" squared , right bracex=I0<y<I2
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表达式11: "y" equals "f" left parenthesis, "J" , right parenthesis left brace, "J" less than "x" less than "J" plus "n" , right bracey=fJJ<x<J+n
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表达式12: "J" equals left bracket, 0 , "n" , ... , 3.5 minus "n" , right bracketJ=0,n,...,3.5−n
