表达式1: "y" equals left bracket, 12 , 7 , 9 , 4 , 5 , 0 , 5 , 7 , right bracket left brace, 0 less than or equal to 0.5 "x" minus left bracket, 1 , ...8 , right bracket plus 15 less than or equal to 1 , right brace 有图表。 要进行音频跟踪,按“Alt 键 + T”。y=12,7,9,4,5,0,5,70≤0.5x−1,...8+15≤1