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Warning: fclose() expects parameter 1 to be resource, bool given in /www/wwwroot/www.wendadaohang.com/inc/function.php on line 2475 对于2次函数f(x)=x2+px+q 已知集合A={x|f(x)=x}={-1,3} 集合B={x|[f(fx)]=x} 求集合B - 66问答网