表达式12: "m" equals "l" Subscript, 2 , Baseline times "a"m=l2·a
12
表达式13: "a" equals left parenthesis, "d" times StartFraction, 1 Over "l" Subscript, 1 , Baseline , EndFraction times StartFraction, 1 Over "l" Subscript, 2 , Baseline , EndFraction , right parenthesisa=d·1l1·1l2
13
表达式14: "d" equals left parenthesis, "x" Subscript, 1 , Baseline times "x" Subscript, 2 , Baseline , right parenthesis positive left parenthesis, "y" Subscript, 1 , Baseline times "y" Subscript, 2 , Baseline , right parenthesisd=x1·x2+y1·y2
14
表达式15: left parenthesis, "x" Subscript, 1 , Baseline , "y" Subscript, 1 , Baseline , right parenthesisx1,y1
15
表达式16: left parenthesis, "x" Subscript, 2 , Baseline , "y" Subscript, 2 , Baseline , right parenthesisx2,y2
16
表达式17: left parenthesis, "x" Subscript, 3 , Baseline , "y" Subscript, 3 , Baseline , right parenthesisx3,y3
17
表达式18: "y" negative "y" Subscript, 1 , Baseline equals left parenthesis, StartFraction, "y" Subscript, 1 , Baseline Over "x" Subscript, 1 , Baseline , EndFraction , right parenthesis times left parenthesis, "x" negative "x" Subscript, 1 , Baseline , right parenthesis left brace, min left parenthesis, "y" Subscript, 1 , Baseline , 0 , right parenthesis less than "y" less than max left parenthesis, "y" Subscript, 1 , Baseline , 0 , right parenthesis , right bracey−y1=y1x1·x−x1miny1,0<y<maxy1,0
18
表达式19: "y" negative "y" Subscript, 2 , Baseline equals left parenthesis, StartFraction, "y" Subscript, 2 , Baseline Over "x" Subscript, 2 , Baseline , EndFraction , right parenthesis times left parenthesis, "x" minus "x" Subscript, 2 , Baseline , right parenthesis left brace, min left parenthesis, "y" Subscript, 2 , Baseline , 0 , right parenthesis less than "y" less than max left parenthesis, "y" Subscript, 2 , Baseline , 0 , right parenthesis , right bracey−y2=y2x2·x−x2miny2,0<y<maxy2,0
19
表达式20: "y" negative "y" Subscript, 3 , Baseline equals left parenthesis, StartFraction, "y" Subscript, 3 , Baseline Over "x" Subscript, 3 , Baseline , EndFraction , right parenthesis times left parenthesis, "x" negative "x" Subscript, 3 , Baseline , right parenthesis left brace, min left parenthesis, "y" Subscript, 3 , Baseline , 0 , right parenthesis less than "y" less than max left parenthesis, "y" Subscript, 3 , Baseline , 0 , right parenthesis , right bracey−y3=y3x3·x−x3miny3,0<y<maxy3,0
20
表达式21: "y" negative "y" Subscript, 2 , Baseline equals left parenthesis, StartFraction, "y" Subscript, 3 , Baseline minus "y" Subscript, 2 , Baseline Over "x" Subscript, 3 , Baseline negative "x" Subscript, 2 , Baseline , EndFraction , right parenthesis times left parenthesis, "x" negative "x" Subscript, 2 , Baseline , right parenthesis left brace, min left parenthesis, "y" Subscript, 2 , Baseline , "y" Subscript, 3 , Baseline , right parenthesis less than "y" less than max left parenthesis, "y" Subscript, 2 , Baseline , "y" Subscript, 3 , Baseline , right parenthesis , right bracey−y2=y3−y2x3−x2·x−x2miny2,y3<y<maxy2,y3
