表达式3: left parenthesis, "v" left parenthesis, "t" , right parenthesis , "w" left parenthesis, "t" , right parenthesis left brace, 0 less than or equal to "t" less than or equal to "a" , right brace , right parenthesisvt,wt0≤t≤a
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： 100100
3
表达式4: "a" equals 10a=10
00
1010
4
标签 left parenthesis, "v" left parenthesis, "a" , right parenthesis , "w" left parenthesis, "a" , right parenthesis , right parenthesisva,wa
