#include <iostream> #include <cmath> using namespace std; int main() { cout <<"enter m1,m2,r,λ\n"; float m1,m2,r,λ ; cin >> m1 >>m2 >>r >> λ; if (pow(r,2)!=0){ cout << "λ*(m1*m2)=" << λ*(m1*m2); }else{ cout << "no solutions"; } return 0; }