表达式4: "n" Subscript, 1 , Baseline equals "e" Superscript, left parenthesis, negative "n" minus "l" Subscript, 2 , Baseline , right parenthesis , Baseline 有图表。 要进行音频跟踪，按“Alt 键 + T”。n1=e−n−l2
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表达式5: "n" Subscript, 2 , Baseline equals "e" Superscript, left parenthesis, "n" minus "l" Subscript, 2 , Baseline , right parenthesis , Baselinen2=en−l2
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表达式6: "n" Subscript, 12 , Baseline equals StartFraction, "n" Subscript, 1 , Baseline Over left parenthesis, "n" Subscript, 1 , Baseline positive 1 , right parenthesis , EndFraction 有图表。 要进行音频跟踪，按“Alt 键 + T”。n12=n1n1+1
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表达式7: "n" Subscript, 22 , Baseline equals StartFraction, "n" Subscript, 2 , Baseline Over left parenthesis, "n" Subscript, 2 , Baseline plus 1 , right parenthesis , EndFraction 有图表。 要进行音频跟踪，按“Alt 键 + T”。n22=n2n2+1
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表达式8: "y" equals "n" Subscript, 22 , Baseline negative "n" Subscript, 12 , Baseline 有图表。 要进行音频跟踪，按“Alt 键 + T”。y=n22−n12
