#include <bits/stdc++.h>
using namespace std;
#define int long long
int gcd(int a,int b){
	if(b==0)return a;
	return gcd(b,a%b);
}
int lcm(int a,int b){
	return a*b/gcd(a,b);
}
signed main(){
	int a,b;
	cin>>a>>b;
	int sum=0,sum2=0;
	while(a){
		sum+=a%10;
		a/=10;
	}
	while(b){
		sum2+=b%10;
		b/=10;
	}
	cout<<lcm(sum,sum2);
}

Xin 5 sao + cảm ơn nhé bạn!

$#doanthevu$

Code C++:

#include <bits/stdc++.h>
#define ll long long
using namespace std;
ll tt(ll n)
{
    ll s=0;
    while(n!=0) 
    {
        s+=n%10;
        n/=10;
    }
    return s;
}
int main()
{
    ll a,b,n,m;
    cin>>a>>b;
    ll gcd=__gcd(tt(a),tt(b));
    ll tong=(n*m)/gcd;
    cout<<tong<<endl;
    return 0;
}