Sử dụng câu lệnh if- then dạng thiếu để viết phương trình bậc hai : ax^2+ bx +c=0

2 câu trả lời

#include <iostream>
#include <conio.h>
#include <math.h>
using namespace std;

int main()
{

    float a, b, c, delta, x1, x2;
    cout << "a";
    cin >> a;
    cout << "b";
    cin >> b;
    cout << "c";
    cin >> c;
    if(a == 0) {
        if(b == 0) {
            if (c == 0) {
                cout << "Phuong trinh vo so nghiem" << endl;
            } else {
                cout << "Phuong trinh vo nghiem" << endl;
            }
        } else {
            cout << "Phuong trinh co nghiem duy nhat: " << -c/b << endl;
        }
    } else {
        delta = b*b - 4*a*c;
        if(delta > 0) {
            x1 = (-b+sqrt(delta))/(2*a);
            x2 = (-b-sqrt(delta))/(2*a);
            cout << "Nghiem thu nhat x1 = " << x1 << endl;
            cout << "Nghiem thu hai x2 = " << x2 << endl;
        } else if ( delta == 0) {
            cout << "Phuong trinh co nghiem kep: x1 = x2 = " << -b/2*a << endl;
        } else {
            cout << "Phuong trinh vo nghiem" << endl;
        }
    }
    return 0;
}

import math
a = float(input("Nhập Hệ Số a: "))
b = float(input("Nhập Hệ Số b: "))
c = float(input("Nhập Hệ Số c: "))
delta = b*b - 4*a*c
if delta < 0:
    print("\nPhương Trình Vô Nghiệm !")
elif delta == 0:
    print("\nPhương Trình Có Nghiệm Kep x1 = x2", -b/(2*a))
else:
    x1 = (-b - math.sqrt(delta))/(2*a)
    x2 = -b/a - x1
    print("\nPhương Trình Có 2 Nghiệm Phân Biệt ")
    print("x1 = ",x1, "x2 = ", x2)

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giup e voi I/ Supply the correct form of the verbs in brackets 1. You (think) ……………………… collecting stamps costs much money? 2. Every year, my mother (give) ……………………… me a nice doll on my birthday. 3. Jenny says she loves collecting pens but she (not/continue) ……………………… this hobby from next year. 4. If you wash your hands more, you (have)……………………. less chance of catching flu. 5. Getting plenty of rest is very good. It (help)…………………. you to avoid depression. 6. Mr. John (be) ……………………… principal of our school since last year. 7. I (see) ……………………… a car accident on this corner yesterday. 8. We like (come)……………………to school by bus, but we hate (stand)………………………. and (wait) …………………… in the rain. 9. ……………………… (you/ ever/ meet) anyone famous? 10. My mother (come) ……………………… to stay with us next weekend. 11. When he lived in Manchester, he (work) ……………………… in a bank. 12. We (be) ……………………… students for four years. 13. We are planting trees around our school now. Our school (be) ……………………… surrounded by a lot of green trees. 14. What ……………………… your father usually ……………………… (do) in the evenings? 15. My sister likes (cook) ……………………… very much. She can cook many good foods. 16. My father says when he's retired, he (go) …………………… back to his village to do the gardening. 17. They want (buy) ……………………… some meat for dinner. 18. Linh is my best friend. We (know) ……………………… each other for 5 years. 19. I enjoy (fish) ……………………… because it is relaxing. 20. How about (go) ……………………… to the movie theatre?

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