表达式4: left parenthesis, "y" minus "a" . "y" , right parenthesis equals StartFraction, "b" . "y" minus "a" . "y" Over "b" . "x" minus "a" . "x" , EndFraction left parenthesis, "x" minus "a" . "x" , right parenthesis 有图表。 要进行音频跟踪，按“Alt 键 + T”。y−a.y=b.y−a.yb.x−a.xx−a.x
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表达式5: left parenthesis, "y" minus "a" . "y" , right parenthesis minus StartFraction, "b" . "y" minus "a" . "y" Over "b" . "x" minus "a" . "x" , EndFraction left parenthesis, "x" minus "a" . "x" , right parenthesis equals 0 有图表。 要进行音频跟踪，按“Alt 键 + T”。y−a.y−b.y−a.yb.x−a.xx−a.x=0
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表达式6: "y" minus StartFraction, "b" . "y" minus "a" . "y" Over "b" . "x" minus "a" . "x" , EndFraction "x" equals "a" . "y" minus "a" . "x" StartFraction, "b" . "y" minus "a" . "y" Over "b" . "x" minus "a" . "x" , EndFraction 有图表。 要进行音频跟踪，按“Alt 键 + T”。y−b.y−a.yb.x−a.xx=a.y−a.xb.y−a.yb.x−a.x
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表达式7: left parenthesis, "b" . "x" minus "a" . "x" , right parenthesis "y" minus left parenthesis, "b" . "y" minus "a" . "y" , right parenthesis "x" greater than left parenthesis, "b" . "x" minus "a" . "x" , right parenthesis "a" . "y" minus left parenthesis, "b" . "y" minus "a" . "y" , right parenthesis "a" . "x" 有图表。 要进行音频跟踪，按“Alt 键 + T”。b.x−a.xy−b.y−a.yx>b.x−a.xa.y−b.y−a.ya.x
