表达式19: StartFraction, "f" Subscript, "y" , Baseline left parenthesis, "x" , right parenthesis Over 1 minus "b" plus "b" StartNestedFraction, "f" Subscript, "E" , Baseline left parenthesis, "x" , right parenthesis NestedOver .5 , EndNestedFraction , EndFraction minus 1.5fyx1−b+bfEx.5−1.5
19
表达式20: "b" equals 1b=1
00
11
20
隐藏 标签 left parenthesis, 0 , "b" minus 3.5 , right parenthesis0,b−3.5
标签
equals=
left parenthesis, 0 , negative 2.5 , right parenthesis0,−2.5
21
表达式22: left parenthesis, 0 , "t" minus 3.5 , right parenthesis0,t−3.5
定义域t最小值： 00
less than or equal to "t" less than or equal to≤t≤
