表达式3: Start integral from 1 to 2, end integral, "f" left parenthesis, "x" , right parenthesis "d" "x" equals negative 0.2 5∫21fxdx
equals=
negative 0.2 5−0.25
3
表达式4: 0 less than or equal to "y" less than or equal to "f" left parenthesis, "x" , right parenthesis left brace, 0 less than or equal to "x" less than or equal to 1 , right brace 有图表。 要进行音频跟踪，按“Alt 键 + T”。0≤y≤fx0≤x≤1
4
表达式5: "f" left parenthesis, "x" , right parenthesis less than or equal to "y" less than or equal to 0 left brace, 1 less than or equal to "x" less than or equal to 2 , right brace 有图表。 要进行音频跟踪，按“Alt 键 + T”。fx≤y≤01≤x≤2
