Given?f(x)=ax3+bx2+cx+d,if?when?x takes?the?value?of?its?inverse?number,the?corresponding?value?of?f(x)is?also?the?inverse?number,and?f(2)=0,then =______
.(英汉小词典:inverse?number?相反数)
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解:由题意得:f(2)=f(-2)=0,
代入有:8a+4b+2c+d=0 ①;-8a+4b-2c+d=0 ②,
两式相加得:d=-4b,
两式相减得:c=-4a,
∴c+d=-4(a+b),
∴=-4.
故