表达式15: "a" left parenthesis, "o" Subscript, "r" "a" "n" "g" "e" 1 , Baseline left parenthesis, "t" , right parenthesis , right parenthesis plus "b" left parenthesis, "o" Subscript, "r" "a" "n" "g" "e" 2 , Baseline left parenthesis, "t" , right parenthesis , right parenthesis plus "c" equals 0aorange1t+borange2t+c=0
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表达式16: "a" left parenthesis, "x" Subscript, 0 , Baseline plus "d" "t" , right parenthesis plus "b" left parenthesis, "y" Subscript, 0 , Baseline plus "k" "t" , right parenthesis plus "c" equals 0ax0+dt+by0+kt+c=0
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表达式17: "a" "x" Subscript, 0 , Baseline plus "a" "d" "t" plus "b" "y" Subscript, 0 , Baseline plus "b" "k" "t" plus "c" equals 0ax0+adt+by0+bkt+c=0
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表达式18: left parenthesis, "a" "d" plus "b" "k" , right parenthesis "t" equals negative "a" "x" Subscript, 0 , Baseline minus "b" "y" Subscript, 0 , Baseline minus "c"ad+bkt=−ax0−by0−c
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表达式19: "t" Subscript, 1 , Baseline equals StartFraction, negative "a" "x" Subscript, 0 , Baseline minus "b" "y" Subscript, 0 , Baseline minus "c" Over "a" "d" plus "b" "k" , EndFractiont1=−ax0−by0−cad+bk
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表达式20: "s" Subscript, 1 , Baseline equals "o" Subscript, "r" "a" "n" "g" "e" 1 , Baseline left parenthesis, "t" Subscript, 1 , Baseline , right parenthesiss1=orange1t1
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表达式21: "s" Subscript, 2 , Baseline equals "o" Subscript, "r" "a" "n" "g" "e" 2 , Baseline left parenthesis, "t" Subscript, 1 , Baseline , right parenthesiss2=orange2t1
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表达式22: left parenthesis, "s" Subscript, 1 , Baseline , "s" Subscript, 2 , Baseline , right parenthesiss1,s2
