表达式1: "y" equals negative StartFraction, 1 Over left parenthesis, "x" minus 4 , right parenthesis squared , EndFraction minus StartFraction, 1 Over left parenthesis, "x" plus 4 , right parenthesis squared , EndFraction 有图表。 要进行音频跟踪,按“Alt 键 + T”。y=−1x−42−1x+42