#include <stdio.h>
#include <math.h>
int main()
{  float x,y,a;printf("请你输入x的值:\n");scanf("%f",&x);if (x<=-300)y=-1;if (x>=300)y=-1;elsey=(x*x*x)/log10(x+2.6) ;printf("f(%0.03f)=%0.03f",x,y);return 0;
}