已知三次函数y=f (x)有三个零点x1,x2,x3,且在点(xi,f(xi))处的切线斜率为ki(i=1,2,3),则1/k1+1/k2+1/k3=_____
问题描述:
已知三次函数y=f (x)有三个零点x1,x2,x3,且在点(xi,f(xi))处的切线斜率为ki(i=1,2,3),则1/k1+1/k2+1/k3=_____
答
已知三次函数y=f (x)有三个零点x1,x2,x3,且在点(xi,f(xi))处的切线斜率为ki(i=1,2,3),则1/k1+1/k2+1/k3=_____