表达式18: StartFraction, left parenthesis, "x" minus "h" , right parenthesis squared Over "a" squared , EndFraction minus StartFraction, left parenthesis, "y" minus "v" , right parenthesis squared Over "b" squared , EndFraction greater than or equal to 1x−h2a2−y−v2b2≥1
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表达式19: "f" left parenthesis, "x" , right parenthesis equals "S" Subscript, "i" "g" "n" , Baseline StartRoot, StartFraction, "b" squared left parenthesis, "x" minus "h" , right parenthesis squared Over "a" squared , EndFraction minus "b" squared , EndRoot plus "v"fx=Signb2x−h2a2−b2+v
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Coordinates
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表达式21: "f" Subscript, 1 "x" , Baseline equals "h" minus "c"f1x=h−c
