}

if(dr==0)

{

x1=(-b sqrt(dr))/(2*a);

printf(“x=%.2f

“，x1);

}

if(dr0)

{

x1=(-b-sqrt(dr))/(2*a);

x2=(-b sqrt(dr))/(2*a);

printf(“(x1=%.2f，y1=%.2f)“，x1，a1*pow(x1，3) b1*pow(x1，2) c*x1 d1);

printf(“(x2=%.2f，y2=%.2f)

“，x2，a1*pow(x2，3) b1*pow(x2，2) c*x2 d1);

}

if(dr==0)

{

x1=(-b sqrt(dr))/(2*a);

printf(“(x=%.2f，y=%.2f)

“，x1，a1*pow(x1，3) b1*pow(x1，2) c*x1 d1);

}

if(dr

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