作者：aaaaaa师太_667 | 来源：互联网 | 2023-01-29 19:27
题意，思路很清楚，附上代码：
#include
#include
using namespace std;
double func(double x)
{
return (8 * x*x*x*x + 7 * x*x*x + 2 * x*x + 3 * x + 6);
}
int main()
{
int t;
cin >> t;
while (t--)
{
int y;
cin >> y;
double first, mid, tail;
first = 0; tail = 100;
if (func(first) > y||func(tail) {
cout <<"No solution!" < }
else
{
mid = (first + tail) / 2;
while (fabs(func(mid) - y) > 1e-4)
{
if (func(mid) > y)
{
tail = mid; mid = (tail + first) / 2;
}
else
{
first = mid; mid = (tail + first) / 2;
}
}
printf("%.4lf\n", mid);
}
}
system("pause");
}
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