表达式3: "y" equals .2 "x" squared plus 6 left brace, negative 4.5 less than "x" less than 4.5 , right brace 有图表。 要进行音频跟踪,按“Alt 键 + T”。y=.2x2+6−4.5<x<4.5
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表达式4: "y" equals .0 5 "x" squared plus 9 left brace, negative 4.5 less than "x" less than 4.5 , right brace 有图表。 要进行音频跟踪,按“Alt 键 + T”。y=.05x2+9−4.5<x<4.5
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表达式5: "y" equals negative .0 5 "x" squared plus 11 left brace, negative 4.5 less than "x" less than 4.5 , right brace 有图表。 要进行音频跟踪,按“Alt 键 + T”。y=−.05x2+11−4.5<x<4.5