表达式19: "X" left parenthesis, "u" , "v" , right parenthesis equals left parenthesis, 1 minus "v" , right parenthesis left parenthesis, left parenthesis, 1 minus "u" , right parenthesis "x" Subscript, "A" , Baseline plus "u" "x" Subscript, "B" , Baseline , right parenthesis plus "v" left parenthesis, left parenthesis, 1 minus "u" , right parenthesis "x" Subscript, "C" , Baseline plus "u" "x" Subscript, "D" , Baseline , right parenthesisXu,v=1−v1−uxA+uxB+v1−uxC+uxD
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表达式20: "Y" left parenthesis, "u" , "v" , right parenthesis equals left parenthesis, 1 minus "v" , right parenthesis left parenthesis, left parenthesis, 1 minus "u" , right parenthesis "y" Subscript, "A" , Baseline plus "u" "y" Subscript, "B" , Baseline , right parenthesis plus "v" left parenthesis, left parenthesis, 1 minus "u" , right parenthesis "y" Subscript, "C" , Baseline plus "u" "y" Subscript, "D" , Baseline , right parenthesisYu,v=1−v1−uyA+uyB+v1−uyC+uyD
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表达式21: left parenthesis, "X" left parenthesis, "t" , "V" left parenthesis, "t" , right parenthesis , right parenthesis , "Y" left parenthesis, "t" , "V" left parenthesis, "t" , right parenthesis , right parenthesis , right parenthesis , left parenthesis, "X" left parenthesis, "t" , 1 minus "V" left parenthesis, "t" , right parenthesis , right parenthesis , "Y" left parenthesis, "t" , 1 minus "V" left parenthesis, "t" , right parenthesis , right parenthesis , right parenthesisXt,Vt,Yt,Vt,Xt,1−Vt,Yt,1−Vt
定义域t最小值： 00
less than or equal to "t" less than or equal to≤t≤
定义域t最大值： 11
21
表达式22: "V" left parenthesis, "t" , right parenthesis equals 1 half plus StartRoot, 1 quarter minus left parenthesis, "t" minus 1 half , right parenthesis squared , EndRootVt=12+14−t−122
