C++ :

#include<iostream>
#include<cstdio>
#include<algorithm>
using namespace std;
typedef long long ll;
const ll MAXN = 1e5+5;

struct Fen{
    ll zi,mu;
};

ll gcd(ll a,ll b){
    if(a<0) a=-a;
    if(b==0) return a;
    return gcd(b,a%b);
}

Fen add(Fen x, Fen y){
    Fen r;
    r.zi = x.zi*y.mu+x.mu*y.zi;
    r.mu = x.mu*y.mu;
    return r;
}

Fen yue(Fen x){
    if(x.mu<0){
        x.zi=-x.zi;
        x.mu=-x.mu;
    }
    ll g = gcd(x.zi,x.mu);
    x.zi/=g;
    x.mu/=g;
    return x;
}

void print(Fen x){
    x=yue(x);
    //printf("begin print x.zi%=lld,x.mu=%lld\n",x.zi,x.mu);
    if(x.zi==0){
        cout<<0;
        return;
    }
    if(x.mu==1){
        cout<<x.zi;
        return;
    }
    cout<<x.zi<<"/"<<x.mu;
}

ll strip(ll x){
    ll r= 1;
    for(ll i=2;i*i<=x;i++){
        while(x%(i*i)==0){
            r*=i;
            x/=(i*i);
        }
    }
    return r;
}

int main(){
   
    ll T,M;
    cin>>T>>M;
    while(T--){
        ll a,b,c;
        cin>>a>>b>>c;
        if(a<0){
            a=-a;
            b=-b;
            c=-c;
        }
        ll d = b*b-4*a*c;
        if(d<0){
            cout<<"NO"<<endl;
            continue;
        }
        if(d==0){
            Fen q;
            q.zi = -b;
            q.mu = 2*a;
            q=yue(q);
            print(q);
            cout<<endl;
            continue;
        }
        Fen q1,q2;
        q1.zi=-b;
        q1.mu=2*a;
        q2.zi=1;
        q2.mu=2*a;
        ll ss = strip(d);
        d/=ss*ss;
        //printf("ss=%lld,d=%lld\n",ss,d);
        if(d==1){
            q2.zi*=ss;
            q2 = add(q1,q2);
            q2=yue(q2);
            print(q2);
            cout<<endl;
            continue;
        }
        if(q1.zi!=0){
            print(q1);
            cout<<"+";
        }
        q2.zi*=ss;
        q2=yue(q2);
        if(q2.zi==1&&q2.mu==1){
            cout<<"sqrt("<<d<<")"<<endl;
        } else if(q2.mu==1){
            cout<<q2.zi<<"*sqrt("<<d<<")"<<endl;
        } else if(q2.zi==1){
            cout<<"sqrt("<<d<<")/"<<q2.mu<<endl;
        } else {
            cout<<q2.zi<<"*sqrt("<<d<<")/"<<q2.mu<<endl;
        }
    }
    return 0;
}