10 条题解

  • 1
    @ 2025-7-4 18:47:59
    #include <stdio.h>
    #include <math.h>
    #include <iostream>
    using namespace std;
    int main()
    {
    	double x1,x2;
    	double a,b,c;
        cin >> a >> b >> c;
        if ((b * b - 4 * a * c) < 0)
        {
            cout<<"No answer!";
        }
        else
        {
            if((b * b - 4 * a * c) == 0)
            {
            	x1 = -1 * (b / (2 * a));
                printf("X1=X2=%.5lf\n",x1);
            }
            else
            {
            	x1 = (-b + sqrt(b*b - 4*a*c))/(2*a);
            	x2 = (-b - sqrt(b*b - 4*a*c))/(2*a);
                if(x1 > x2)
                {
                    swap(x1,x2);
                }
                printf("x1=%.5lf;x2=%.5lf\n",x1,x2);
            }
        }
    
    }
    
    • 1
      @ 2024-12-1 19:01:57
      #include<bits/stdc++.h>
      using namespace std;
      const int INF=0x3f3f3f3f;
      int const N=1e5+10;
      double a,b,c;
      int main(){
      	cin>>a>>b>>c;
      	double x1=(-b+sqrt(b*b-4*a*c))/(2*a),x2=(-b+-sqrt(b*b-4*a*c))/(2*a);
      	if(a==0){
      		cout<<"No answer!";
      		return 0;
      	}else if(b*b-4*a*c<0){
      		cout<<"No answer!";
      		return 0;
      	}
      	else if(x1==x2){
      		cout<<"x1=x2="<<fixed<<setprecision(5)<<x1;
      	}else if(x1<x2){
      		cout<<"x1="<<fixed<<setprecision(5)<<x1<<";x2="<<fixed<<setprecision(5)<<x2;
      	}else if(x1>x2){
      		cout<<"x1="<<fixed<<setprecision(5)<<x2<<";x2="<<fixed<<setprecision(5)<<x1;
      	}
      	return 0;
      }
      
      • 1
        @ 2023-3-26 20:25:11

        876AC代码,之前的题解都是错的

        //需注意:当b*b-4*a*c<0时,没有答案
        #include<iostream>
        #include<iomanip>
        #include<stdio.h>
        #include<math.h>
        using namespace std;
        int main(){
        	double a,b,c,x,y;
        	cin>>a>>b>>c;
        	if(a==0||b*b-4*a*c<0){
        		cout<<"No answer!";
        		return 0;
        	}
        	x=(-b+sqrt(b*b-4*a*c))/(2*a);
        	y=(-b-sqrt(b*b-4*a*c))/(2*a);
        	if(fabs(x-y)<1e-6){
        		printf("x1=x2=%.5lf",x);
        		return 0;
        	} 
        	if(x>y)swap(x,y);
        	printf("x1=%.5lf;x2=%.5lf",x,y);
        	return 0;
        }
        
        • 0
          @ 2022-8-16 11:30:35
          #include <stdio.h>
          #include <math.h>
          #include <iostream>
          using namespace std;
          int main()
          {
          	double a,b,c;
              cin >> a >> b >> c;
              if (a==0)
              {
                  cout<<"No answer!";
              }
              else
              {
                  double x1,x2;
                  x1 = (-b + sqrt(b*b - 4*a*c))/(2*a);
                  x2 = (-b - sqrt(b*b - 4*a*c))/(2*a);
                  if( fabs(x1-x2)< 1e-6)
                  {
                      printf("X1=X2=%.5lf\n",x1);
                  }
                  else
                  {
                      if(x1 > x2)
                      {
                          swap(x1,x2);
                      }
                      printf("x1=%.5lf;x2=%.5lf\n",x1,x2);
                  }
              }
          
          }
          
          • -1
            @ 2023-3-26 22:01:02
            #include <stdio.h>
            #include <math.h>
            #include <iostream>
            using namespace std;
            int main()
            {
            	double a,b,c;
                cin >> a >> b >> c;
                if (a==0)
                {
                    cout<<"No answer!";
                }
                else
                {
                    double x1,x2;
                    x1 = (-b + sqrt(b*b - 4*a*c))/(2*a);
                    x2 = (-b - sqrt(b*b - 4*a*c))/(2*a);
                    if( fabs(x1-x2)< 1e-6)
                    {
                        printf("X1=X2=%.5lf\n",x1);
                    }
                    else
                    {
                        if(x1 > x2)
                        {
                            swap(x1,x2);
                        }
                        printf("x1=%.5lf;x2=%.5lf\n",x1,x2);
                    }
                }
            
            }
            
            • -1
              @ 2023-3-10 20:00:03

              真题解


              https://jingyan.baidu.com/article/ca00d56c2e0952e99eebcf86.html


              不会一元二次的人一定要看

              完整代码如下:

              #include <stdio.h>
              #include <math.h>
              #include <iostream>
              using namespace std;
              int main()
              {
              	double x1,x2;
              	double a,b,c;
                  cin >> a >> b >> c;
                  if ((b * b - 4 * a * c) < 0)
                  {
                      cout<<"No answer!";
                  }
                  else
                  {
                      if((b * b - 4 * a * c) == 0)
                      {
                      	x1 = -1 * (b / (2 * a));
                          printf("X1=X2=%.5lf\n",x1);
                      }
                      else
                      {
                      	x1 = (-b + sqrt(b*b - 4*a*c))/(2*a);
                      	x2 = (-b - sqrt(b*b - 4*a*c))/(2*a);
                          if(x1 > x2)
                          {
                              swap(x1,x2);
                          }
                          printf("x1=%.5lf;x2=%.5lf\n",x1,x2);
                      }
                  }
              
              }
              
              • -1
                @ 2022-2-9 11:14:53

                #include #include <math.h> #include using namespace std; int main() { double x,y,a,b,c; cin>>a>>b>>c; if (a==0) { cout<<"No answer!"; return 0; } x=(sqrt(bb-4ac)-b)/(2a); y=(-sqrt(bb-4ac)-b)/(2a); if (x>y){ swap(x,y); } if (fabs(x-y)<1e-6) { cout<<"x1=x2="<<fixed<<setprecision(5)<<x<<endl; } else { cout<<"x1="<<fixed<<setprecision(5)<<x<<";x2="<<fixed<<setprecision(5)<<y<<endl; } }

                • -1
                  @ 2022-1-7 10:57:41
                  #include <stdio.h>
                  #include <math.h>
                  #include <iostream>
                  using namespace std;
                  int main()
                  {
                  	double a,b,c;
                      cin >> a >> b >> c;
                      if (a==0)
                      {
                          cout<<"No answer!";
                      }
                      else
                      {
                          double x1,x2;
                          x1 = (-b + sqrt(b*b - 4*a*c))/(2*a);
                          x2 = (-b - sqrt(b*b - 4*a*c))/(2*a);
                          if( fabs(x1-x2)< 1e-6)
                          {
                              printf("X1=X2=%.5lf\n",x1);
                          }
                          else
                          {
                              if(x1 > x2)
                              {
                                  swap(x1,x2);
                              }
                              printf("x1=%.5lf;x2=%.5lf\n",x1,x2);
                          }
                      }
                  
                  }
                  
                  • -1
                    @ 2022-1-7 10:46:55
                    #include <iostream>
                    #include <math.h>
                    #include<iomanip>
                    using namespace std;
                    int main()
                    {
                        double x,y,a,b,c;
                        cin>>a>>b>>c;
                        if (a==0)
                        {
                            cout<<"No answer!";
                            return 0;
                        }
                        x=(sqrt(b*b-4*a*c)-b)/(2*a);
                        y=(-sqrt(b*b-4*a*c)-b)/(2*a);
                        if (x>y){
                            swap(x,y);
                        }
                        if (fabs(x-y)<1e-6)
                        {
                            cout<<"x1=x2="<<fixed<<setprecision(5)<<x<<endl;
                        }
                        else
                        {
                            cout<<"x1="<<fixed<<setprecision(5)<<x<<";x2="<<fixed<<setprecision(5)<<y<<endl;
                        }
                    }
                    
                    • -2
                      @ 2024-6-15 20:13:28

                      #include<bits/stdc++.h> using namespace std; int main(){ for(long long i=0;i<=514514;i++){ cout<<"1111111111111111111111111111111111111111111111111"; } return 0; }

                      • 1

                      信息

                      ID
                      876
                      时间
                      1000ms
                      内存
                      256MiB
                      难度
                      6
                      标签
                      递交数
                      713
                      已通过
                      193
                      上传者