表达式2: "f" Subscript, "r" , Baseline left parenthesis, "x" , right parenthesis equals 2 plus "x" 有图表。 要进行音频跟踪,按“Alt 键 + T”。frx=2+x
2
表达式3: "f" Subscript, "l" , Baseline left parenthesis, "x" , right parenthesis less than or equal to "f" Subscript, "r" , Baseline left parenthesis, "x" , right parenthesis 有图表。flx≤frx